I just measured my 32 andand he clearance is 6.5 cm like yours. I measured from the sphere to the inside of the handle like the below pic.It sits on my wrist when my wrist is straight. By allowing the hand to bend back, I can rest it more comfortably further down, but Pavel said don't do that.
I just measured it at 6.4cm on a 32kg. (Not sure my measurement technique was completely accurate but it's close to that.)
You might already know this
but anyway: are you grabbing the handle diagonally in your hand? If not, and the handle is parallel to the line of the calluses, that makes the kettlebell sit higher on your forearm
LOL, I don't know anything. I haven't even touched a kettlebell since a month ago.
The way I figure it has to be one of four things:
1. The kettlebell is the problem
2. The way I'm holding it is the problem
3. The way my arm is shaped is the problem(???)
4. It's not even supposed to be any better, that's just what it's like(!!!)
I've tried various different grips. I can't figure out anything that really feels OK.
I'm not sure exactly what you mean by diagonally but I'll be giving this some more experimentation later.