as a follow-up, it turns out that i have 2 sheered roll pins. the first is the one that goes through the verticle shaft and impeller....easy enough, providing i could have bought the pin at jdl, however, they were OUT. the second is the roll pin below the impeller going through the verticle shaft. to get to it, you have to remove 3 screws, which i did (applause please), but was unable to figure out how to put the new pin back in given it is down inside the plastic housing and not enough clearance to access. oh well, at least i have the new pin...the rest is to figure out. by the way, it seems a bit dangerous to use nails as a substitute for roll pins. clearly, i can see it would get you through in a pinch, but substitutes could result in damage to gears??? i think i'd prefer to sheer/replace a roll pin rather than more expensive gears.