i'd sure buy one too red58 if i can find out for sure if the 228 is supposed to have one. also, i'm gonna try knocking the riser loose also as i suspect it has a function too, even though as i've said, it seems to work fine frozen in place.
great froum and knowledgeable people!

Overland Blue, 1953 GMC 1/2T, 100-22, 228/1bbl, 4sp/4.10 6v, shortbed/fender side/5-window.