I've always been a sucker for the golden area of bicycle part packaging... and one of the nicer example of that are these Fichtel & Sachs Torpedo Cable pulleys and stops for older three speed bikes. Back then, the shifting system of three speed bikes was less varied. Shifting cables were constructed with heads on each end, and they were sold with a pre-designated length of housing for different applications... which means all of the cabling had to be run externally to the frame and could not be passed through any holes in solid cable stops. Three speed bikes all used these for long time:
The housing stop is slotted for the cable to slip into from the side and the housing to sit in. You may take that for granted, but most modern housing stops on the market are solid and require that you thread the shifting cable through like thread through a needle. These parts are really a critical to a good restoration. Also, they come in the common 28.6 mm size for steel frames.
I don't have a ton of them, so get one while you can!
http://www.ebay.com/itm/291808182809
