Window question

Hey guys, I have the cranks in my car, my problem is that the driver's side window is quite easy to put up and down, but the passenger side one is quite difficult to put up, is there anything small I could do to ease it or is it that I have to replace the scissors? or what would I have to do?
 
could be several problems. Usually its one of the rollers on the scissor, the crank mechanism itself. The grease dries up in there (its going on 40 years old). The rollers are cheap (get em at the mustang supply places) and the crank can be lubed, but has to have rivets drilled out and replaced. Not really hard to do, just keep track of everything. The hardest part is getting the scissor out and back in.

Good luck!