I have a Model 33 (the one with the paper tape puncher on the left). Says Model 3320.

We've got all the keys working and can type "The quick brown fox..." but the motor clutch seems to squeak and thump and tries to catch and locks up.  This tends to happen the more it is warmed up.  We immediately turn it off so as not to lock up the motor. There is supposed to be an adjustment for that, but we don't know what it is.  Can anyone point us in the right direction?

Chuck Rehor with the fantastic help of Eric Kudzin and Eric Moore!