I have a cannondale super-v400. Its an archaic frame but its all I have for full squish bike and I can't afford a new frame. The problem is that the derailleur hanging is fixed to the frame with a bolt. That bolt is threaded into the frame and that thread is stripped. Is there an easy solution to this? Its aluminum and I'd rather not helicoil it. Can I throw in some sort of epoxy and just glue the bolt in?

https://wheelsmfg.com/content/view/502/55/

I don't think that's what I'm thinking about. Its a 2 mm wide screw or smaller. It holds the derailleur hanger in place.

I would suggest perhaps getting an aluminum welder to fill in where the screw goes, file it flush, then drill it out and retap the threads. It's aluminum so it shouldn't be hard, maybe just a lot of effort ? I'd first identify the tap that matches the screw you will use and in this case it's the one you will reuse ?

A short, stainless steel sheet metal screw wil work, when you find the right size it will take just a little bit of effort to drive it in the hole (don't use regular steel, it will seize to the aluminum over time).

Gotcha. Yep, I misread. I'd agree - drill and re-tap to a slightly larger size.

Or JB Weld the sucker on and hope to not break the thing.

And save up for a new frame.

You can find a decent replacement that'll work and you can swap most of your parts to for not too much dough if you shop around.

I paid $300 for the bike 3 years ago, so cheap is a relative thing. I'm thinking JB Weld is the route I'm going to go. The frames not worth re-taping. I want to be able to spend another summer beating it mercilessly and then move on.

You may want to consider a heilcoil insert...

https://www.emhart.com/brands/heli-coil

I've used them on occasion not only for bicycles but also for cross threaded/stripped spark plug threads on aluminum heads.