Where could I find a selector switch cap for my AK?
 

Any idea where I can find a cap for the selector switch on a TM AK?

What happened to yours? Got loose and fell out? You just have to buy the AK selector switch some of them comes as a set

I still have it. It is just loose

Put some thread locker on the pins and stick it in. Once the thread locker dries it will not come off until you choose to pry it off yourself.

A wee dab of low-temp hot glue works too.