I was going to write my own post about my re-entry into the kettlebell world and the rapid progress I've made. I'll probably still do that - standby for pain (Nah, I'm a decent writer). Instead, I'm starting by replying on this thread because I was also recently having issues moving from 2H to 1H swings with my preferred bell (24kg at the time).
T'was a scant couple or three weeks ago I decided to bring 1H swings back into the game, but your post really struck a chord with me and my rapid progress has made me very eager to share my experience with you. I am absolutely 100% sure I can help if you haven't already made these discoveries/assimilated the information in some of these replies in the days since your initial post. I'll start from the beginning i.e. my first attempts at 1H swings after being out of the game for awhile.
As an aside, I sprained my right thumb pretty badly a few years back. It was one of those injuries that would have been better if it had been worse. It wasn't bad enough for anything to show up on x-rays, but it's been severely debilitating.
10 sets of 10 2H with the 24kg is no problem for me with the proper amount of rest between sets, so I decided to give 1H a shot. I started with my stronger side (A. because of the injury B. I'm a southpaw). A few reps there, no problem. The injured side, however.....no way, dude. I was in control of the bell as far as safety aspects, but that was it. I'm glad no one was watching.
I gave it a rest for the day, but the first thing I did the next day was do a search about one side being way weaker on the 1H swings. Simple & Sinister: Getting from Two- To One-Hand Swings by Steve Freides (I believe this was the article referred to in ali's response) was the first thing that popped up. Not knowing what in the world I was going to do but knowing that a journey of a thousand miles begins with a single step, this was as good a place to start as any....so that's exactly what I did. Out of deference to my injury, I dropped down to my 16kg (please don't laugh) for swing practice. I can barely feel that thing, so I knew it'd be a good way to train my body in the motions. I QUICKLY advanced through the progressions of interspersing 1H swings with 2H swings suggested in the article and earlier this week did 10x10 1H swings (5 sets each arm)....EASILY. Like I said, I can barely feel my 16kg.
A couple days after resuming my 1H swing practice with my 16kg, my ego needed to combat the emasculation of dropping down to such a light bell. Here's what I did: I resumed practice with my 24kg....but I went back to almost the beginning. I preceded my 1H swing practice with 5 sets of 5 1H deadlifts, but only on my strong side since my stronger side was already aces. It was actually easy for my to add a rep to each set every day until I got to 5x10 1H deadlifts. My strong side is strong; I just have to remind it.
Next step: hike pass practice. My method was to just actively pull the bell back and let it swing forward repeatedly as to avoid repeatedly setting the bell down on my hard wood floor and bug the heck out of the rest of the house. I began to include this on Thursday 30Nov17. I hope you're still with me, because here's where the story takes a turn...for the better. Here we go....hinge the hips, reach for the bell, use my lat to pull the slack out and pack my shoulder just like the book says. 3, 2, 1, ignition. There's nothing at all hard about a hike pass as long as you keep your shoulder packed unless you're using a bell that's just way too darn heavy. Here's the thing, though: I didn't actually do a hike pass. My reflexes took over and I forgot that I was just practicing the simple hike pass. The bell reached the back of the pass, my hips just kinda seemed to thrust forward on their own, and next thing I know, it EFFORTLESSLY is in the air just above my stomach. What....what was that? Was that....was that a 1H swing?....where it didn't feel like the bell was gonna fly out of my hand and finish the job my books have started on the cheap bookcase in front of me?....where it didn't at all feel like the bell is gonna dislocate my shoulder if I hang onto it in favor of said bookcase? Why YES!!!! YES IT WAS!!! Between that freaking me right out and somehow thinking quickly enough to realize that future attempts weren't likely to go as well, I parked the bell. I finished the rest of my hike pass practice, moved on to get-ups, and that was it for the day.
Today, I was a little bit more conscientious. I got the hike pass practice out of the way (only 5x5, and only on my strong side). I was supposed to build up to 5x10 before progressing (and I will include hike pass practice until I do so), but I did a set of 5 1H swings on my strong side just for the thrill of it. Got them done no problem, but I know when I'm about to hit a wall because I jumped the gun. After that, I went to the set/rep scheme I started with interspersing 1H with 2H swings a la the Steve Freides article and I'll work my way back up from there.
There's more. PLEASE bear with me. The following couple paragraphs are about a couple of other responses to your initial post and how they are directly pertinent to my experiences over the past 2-3 weeks.
Firstly, I'll cover Pavel Macek's 3-point response. 1) Use chalk. You've stated that you learned this the hard way. I know I need to get some. Messy, yes; but so much more convenient than drying my hands and the handle of the bell when I need to be focusing on breath control. 2) Use a lighter bell and insert sets with a heavier bell. It may not feel all that good, but even the S&S book says there's nothing wrong with going back to a lighter bell if you need to. Remember....the party is never wrong. Also, inserting sets with a heavier bell is exactly how the S&S book says to go about moving up in weight. 3) Don't overdo grip training....already covered by multiple responders, including another response by Pavel M. himself.
Then there's Steve W's response, also with multiple points. I'll paraphrase. 1) Heavier bells require an adjustment in technique. We've read in multiple places in S&S and possibly ETK as well that there's nothing like heavy weight to instruct the body. You can learn to listen to what it's telling you, even if you have to include single rep sets. 2) Be patient in the hole. The bell fights you. You're robbing yourself of power if you try to fight back. Work with it instead.....like aikido I guess. 3) Smooth hip drive. Chubbs had it right if you've ever seen Happy Gilmore: It's all in the hips. What REALLY drove this home for me is my accidental 1H swing the other day. I WASN'T EVEN TRYING!! It was the SMOOTHEST hip drive I have ever executed, and next thing I know, I'm standing straight up with the bell in front of me instead of still in the silverback position as I'd intended. This kind of goes back to point 1. Heavier bells require technique adjustments. True, no matter the weight of the kettlebell, the hip drive is explosive. There are different types of explosives for a reason (I was a combat engineer in the Marine Corps). Lighter bell - explode like C4. Heavier bell - explode like ammonium nitrate (it's slower, but builds more force). If you need to blow a door open (lighter kettlebell), use C4. If you need to take a wall down, that's where the ammonium nitrate comes in.
I hope you're still here. There's a difference between simply relaying information and conveying information by relating personal experience. I'm just stoked that somebody else is going through kind of the same thing as me and that I had the tools to be able to help. Just be glad this didn't take as long to read as it did to write lol.