I wanted a longer bolt handle as well as larger knob on a 1903 target rifle I built and used a 1" ball bearing for the alteration.
First grind the old ball off using bench grinder and leaving a round end on your handle. Next anneal the ball and drill hole (using small lathe) to fit the rounded stub. I left the stub full length and only slipped the ball about 1/2 way on the handle to get maximum length and soft soldered it in place. Here are a couple of pictures of the results:
The flat on bottom of knob was necessary to provide for proper trigger finger placement due to extra large bolt knob, but would not be needed w/normal diameter knob. Works great on rapid fire strings w/extra leverage.
Regards,
hm
