I've been working on bikes for a couple years, including doing some complete overhaul of a few older bikes, but this one has me stumped.
My sister's former college roommate just settled permanently in this area and had her bike shipped up from home. Rather than having a bike shop put it back together after it shipped, she asked me if I could do it. No problem, I figured, probably just have to put some handlebars on.
Anyway, got the bike, took it out of the box, and the chain was twisted. Broke the chain down, fixed the twist, and noticed that the rear derailleur is weird. It looks pretty cheap and is simply labeled "SIS". The frame has no derailleur hanger on it. Rather, it has a plate that is screwed onto the rear dropouts, and the RD bolts onto the plate about inches below the dropout. I through the wheel on and there is literally no spring tension on the derailleur. It just flops lazily down beneath the bike with the pulleys below it, equally limp. There is not b-screw on the derailleur to adjust.
Anyone dealt with something like this before? I'll try to get some pictures up later....
Thanks for the help,