I read this post with great interest and thanks to all posted learned things about the flaps that did not know. I had no idea that the springs and air pressure is all that retracts the flaps - wow. I would have "assumed" they were somehow linked together (left and right sides) but if that's not the case that's good to know!
When Cliff did my last annual he replaced 3 of the six flap tracks because they were "dogboned" I think. I have the nylon rollers (and we just double checked that this morning with a magnet). I am REALLY glad I read this thread because I bought the stuff pictured below to lubricate them. I was surprised to read in several posts above that the nylon rollers should NOT be lubed. Sure enough the service manual shows that. Luckily we had not yet lubed them but unluckily it looks like I bought this stuff for nothing... This stuff meets the "slip-spray" lubricant called out for in the book but only for the steel rollers. Live and learn...
FYI if anyone does need this stuff Sky Geek carries it. It's the only place I could find it.
- Charles