Overall I see 1 3/32"
For the first measurment inward I see 9/16"
For the next inward area I see 7/32"
For the third dimension I see 5/16"
However, there are irregular chamfers, crimps, and wear spots on the shaft, so these #s have some 'slop'...
BTW, Do the repops have a spring mounted inside the handle that allows the shaft to 'flex'?
Thanks, John