Apotropaic_Sphinx t1_jaeendl wrote on February 28, 2023 at 8:59 PM

The pin is pressed into the shaft. You should be able to knock it out from the other side with a punch unless it's in a blind hole.

For a DIY fix, that's tough because the shaft might be hardened steel, and a drill bit won't bite into it. I would scuff both surfaces and use a strong two-part epoxy like JB weld if I was 100% sure I never wanted the cog to be removed from the shaft ever again.

Awordofinterest t1_jaem90t wrote on February 28, 2023 at 9:48 PM

Carbide is great against hardened steel. SDS Masonry bits are amazing at it (Obviously, you don't want any impacts or hammer action, and also you'll struggle to find an SDS carbide bit small enough... Plus you will almost certainly want to use this on a pillar drill (which isn't really an issue with a chuck adapter or something that's atleast more precise than your hands.) The dewalt cobalt standard twist drills are another good option.

As you say, depending on what this gear is moving, Epoxy would probably work a treat.