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.

If you can't replace or alter parts on this bike I'd suggest you take it to a reputable bike shop and let them work on it since you seem to be very unfamiliar with how to work on it. My son fixes our Schwinn bikes but he's had lessons from a friend who worked in a high end bike shop so he knows what he's doing.