Good luck with it. 🙂
With mine, the thread inside the pullers was stripped.
The issue with the thumbwheels is that I think there's a lip where they contact the bridge body there; the plastic washers might work.
The replacement one I got was badly made and the lid over the puller cavity sat too low, so the pullers wouldn't retract inside.
I put vaseline on the screw threads, which makes operation a bit smoother.
The guitar neck's one also has issues.
I guess there's a reason why the quality units cost a lot more.