Humidity and new parts

[Karintunes@AOL.COM]

I'm replacing the repetitions in a S&S model C which has (from a 70's 
rebuild) teflon bushings and hard, noisy pads in the reps.

My problem is... the piano is used to the local 70+ humidity.  
If I dehumidify it, I'm afraid the other friction points and block will get 
loose.  I need new parts that can take some humidity without swelling.  I was 
planning to get S&S factory parts at the owner's request, but I don't know if 
they will tighten up.  
I hope someone can suggest an alternate high-quality brand that can take the 
wet.  Renner didn't work out in another piano here.  Japanese?

Karin Schmitt
Florida Keys