Shifter Cone Screw Keeps Loosening, Thread Locker or Worn? Options

[Spoke]

Every 6 months I have to retighten the cone screw on the shifter. This time it came out real quick. I thought it might come out all together. I couldn't get 2nd without hitting reverse. The picture shows how much the screw backed out.

Not sure how much torque I applied but I was bending the allen wrench.

Questions:

Should I have thread locker on this?

What is the torque required for the cone screw?

Possible that the threads have been widened by repeated looseness?

Why didn't they put a bolt through this to really lock the hub onto the shaft?


TIA

(IMG:style_emoticons/default/beerchug.gif)

[brant]

Intended to be one time use

Replace both. And you’ll be done

[JamesM]

Intended to be one time use

Replace both. And you’ll be done

(IMG:style_emoticons/default/agree.gif) ^^^^ That

But given the price of those stupid screws, if you are in a pinch or if being cheap, use blue threadlock. If you look at a new screw they have a round dot of some sort of thread locker on them. Not sure if this is why they are specified as one use or if there is another mode of failure as well, but this thread locker isnt very useful once its been installed a 2ne time so adding removeable thread locker is good insurance.