Awesome, that's great news. Looks like I can pick up a modern 105 derailleur for must less than trying to find a NOS RX100. I don't exactly care to keep this bike original as it's a 1992 Giant Allegre.

Out of curiosity, is it a common problem for Shimano springs to lose their strength and not want to go into the smallest cog? I'd never seen it before until yesterday. Even after loosening the limit screw, I had to push the derailleur by hand to get it into the smallest gear.

-Collin-