If it was dropped on the hand wheel end, a bent main shaft is a possibility but more likely the shaft just got moved a little to the left. If you've got the machine all cleaned, oiled and freed up but there's still a bind at one spot in the rotation, it's one or the other. Here's what you need to do but I'll probably muck up the details. A block of wood up against the left end of the shaft behind the face plate and give it a whap with a hammer. Not too hard. That should move the shaft that tiny bit to the right to free the bind if the shaft isn't bent. I've done this twice, once it worked and once it didn't because the shaft truly was bent.
Cari