After measuring the area where the handle would go, it would appear that the ends are both .75" the length is about 2.25 " because of the screw on cap on the outer end, the length is adjustable by a little, but 2.25 is what I would say it is. My guess is that it would be a little larger in the middle but not much. I just assume there is a little belly or bulge in the center of the handle. My lathe is down or I would have one cut, still trying to get my lathe to run. I adapted a Treadmill motor to it to make it variable speed about 3 years ago and something has stopped working. I have enough components to replace every thing to get it running again, it just takes time.
Mel