B-bender tuning issues

I have a Fender American Standard Telecaster with a factory-installed Parsons-Green b-bender. The bender works fine mechanically and is easy to tune, but I'm having a strange problem. When I use the bender a lot, the saddle for the b string gets progressively lower (closer to the bridge plate), so that eventually I have to use the height adjusting screws to bring it back into position, then retune the string. I have the factory 6-saddle Tele bridge, currently with a stainless saddle with a Graph Tech insert for the second string. Has anyone else had this problem?

..a drop of nail polish on the threads of the adjusting screws, before you set them to your chosen height..???
:idea:

..a drop of nail polish on the threads of the adjusting screws, before you set them to your chosen height..???
:idea:

+1. that or the non-permanent type of lock-tite.

You can have that problem even without a bender.

Good suggestions, thanks.

True, the same thing can happen with a lot of manual bending.