The keyway on the K301 I'm working on rebuilding is pretty bad, the key slides about half a key width to the side. In looking up alternatives to a new crank, I came across some products that are supposed to fix bad key-ways. One is a Loctite product and the other is Belzona. I found videos for each and attached them below. I've heard of other guys using JB Weld as well. Has anyone used this or is it just a waste of time and needs to be fixed properly?
Loctite-
https://www.youtube.com/watch?v=LLSLtr0ECbc
Belzona -
https://www.youtube.com/watch?v=BOt5V5TZefI