I've come to the realization that 3 speeds are inherently noisy. I just went back to the original Brooks vinyl saddle on the Phillips - even after a liberal coating of dry lube, the thing squeaks at every pedal revolution and bump, the rear fender rattles itself loose every 50-100 miles, and the shift lever drives me so unbelievably insane with it's rattling that it's just second nature to stick my hand under it to keep it still while riding.
Speaking of which, is there any way to silence the springs on an old mattress saddle, or to tighten the shifter enough so that the lever doesn't rattle?