My Schwinn 3 speed bike has several problems that need fixed. First off, the gears are not in working order. When I pulled it out of a shed the gear cable came undone from the wheel. I don't know exactly how to fix that and need instructions. Secondly, When the cable for the gears comes down from the handle bars it goes through a smal pulley wheel that takes it to the bike wheel. The piece of cable the goes around that wheel is flattened and I don't know if that will change its performance. But there is one major rule IT MUST STAY ORIGINAL!! I cannot replace or alter parts that a collector would say make it unoriginal. Please help.