My cousin-inlaw is working or restoring an old John Deere Tractor and came to a point where he needs to make a part for a pushrod that cannot seem to be found for love nor money, I'm sure ther are plenty out there somewhere but right now he can't seem to locate one and wants to get the tractor back together. Its not big, its a 2 inch long 3/4 inch diameter cylinder with a hole on both ends but not through drilled. The one hole is drilled to press fit on the push rod and the other has a semi sphericle bottom for a cam socket. Looks like a simple lathe operation or even just a drill press and the correct sized blank. My question is how would you make the semi spherical bottom of the cam socket?? My thought is to drill is partially out with a normal bit then grind a bit the have a semi circle profile to finish it up and maybe lap it a bit with a ball bearing and some compound. He is thiinking of drilling and finishing it up with a ball grind stone in a drill press. My question is how was this done originallu and/or how would you do it in a home shop.
Thanks
Bill