Not really related to handle thickness but I'll throw this out there for anyone that doesn't already know about them.
I use 1x72 scalloped belts for handle shaping. They're fantastic for curves and radiuses.
I have blocks of wood that I've ground to have the same radius as my wheels (8" & 12") with leather glued to them.
These are my main backers for sandpaper but I also have dowels of different diameters to use in tricky spots like the plunge.
I've been tapping holes for well over 25 years and I'll admit that I'm pretty darned good at it.
However breaking a tap happens and if you've ever broken one you know what a colossal PAIN getting it out can be.
Well I broke a 2-56 last week and finally decided to pull this tapmatic out and see...
I know problems are part of the process but they can be very disheartening.
I've had knives that went sideways every step of the way. And I've had knives that went smooth as buttered glass.
Thankfully I have more knives go easy than not these days.
Hang in there. Worse...