Join Date: May 2002
Location: Trollsville, USA
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Ut-oh, boyfriend! That was one of the shift limiter screws. There are two of them and they keep your derailleur from shifting too far in either direction. It sounds like maybe a trip to the friendly mechanic at your LBS is in order. Mention my name. If he knows me, it might get you a discount!
Since you messed the derailleur up with a screwdriver, you could try to fix it with a screwdriver. Read the instructions at Park Tool
. You probably won't mess things up too much more than they already are.
As for the "hiccups." Riding through creeks and such tends to dirty up your drivetrain. Clean the chain and the derailleurs with citrus degreaser. Oil the chain. Put a drop of oil on the derailleur pivots, too. See if that helps. If the old clean-and-lube doesn't do the trick, then
look for a stiff link. If that fails, get thee to the LBS fer sher.
So many men....so little time!