I thought someone might be interested in seeing the modification I made to the throttle slide of my 50V's carburetor... I (or the previous owner) had sheared the little nub off that keeps it (the slide) from spinning. I found out that J-B Weld is impervious to gasoline, so I Dremeled a channel into the slide and J-B'd a small piece of sheet metal in there, and filed it until it fit. Here are the results:
Now the piece that rides in the keyway is much longer, so hopefully this one will stay put.