I picked up a second hand mountain bike with circa 2003 Deore 9 speed components and rapidfire shifters.
I've gotten the rear derailleur to work perfectly, but I'm having a heck of a time with the front.
I'll adjust it on the stand, and it will shift well for a little while when riding, but then I start missing shifts. That is, the shifter might move all the way in with no resistance and without catching, or it's really hard to press and shift. Once this happens, front shifting becomes amost impossible. I replaced the cable, and that didn't work. I even swapped the shifter with one I had on my old bike from around the same era (maybe a year or two older) and it does exactly the same thing..
I'm thinking of replacing the shifter and the derailleur, but I was wondering if anyone else had some other ideas.