old school Shimano STX rapid fire shifter (sounded like a crack, now no upshift)
I have an old bike that I'm attached to.. I was just riding with the kids and when I was shifting it sounded like/felt like a "crack". Now the right side shifter won't go up from 1. Back derailer, stuck on lowest cog wheel. given the bike is about ... old 15, 20 years... can I even find parts for it? I'm pretty handy, so not afraid to take apart and repair myself... just wondering about parts.