First of all, thanks for a great site, thought I was the only one that liked older mtb's.
The bike that I am riding is a home brew, it was built by a bloke that used to work in a bike shop (I bought it when he was working in the bike shop). For all intents an purposes it looks like a mid to late 90's Marin/Saracen. It has a CrMo frame with Shemano hubs, STX RC chainwheel/crank set and V brakes and twist grip gear change, I know that they are not everyones cup of tea but I quite like them.
Now for a couple of questions. It looks like my rear deraileur, Shimano Alvio RD-MC18, has come to the end of it's life, by that I mean it is very reluctant to go into 8th gear, I have made sure that everything is adjusted properly. When I pet it into 8th you can see the deraileur move but it wont shift into 8th, now if I give the deraileur a light helping hand it shifts into gear. With that all said I think that the springs a little tired and I would like to change the derailer for a better one.
Can I put any 8 speed Shimano deraileur on or does it have to be a direct replacement or can this be rebuilt.