Sticky tonearm lifter on old Rega TT

I've been getting way back into vinyl of late, with an old Rega Planar 2 TT (with Incognito rewire and Expressimo counterweight). But all of a sudden, the tonearm lifter thing -- whatever that is called -- has begun to stick, not only not going all the way down when I start a record, but it also seems to be a bit crooked, a tiny bit elevated on the far end so that the tonearm begins to rub against it as the record is playing. (At least when the darn thing hasn't gone all the way down, if I'm making any sense here.) Is there some kind of adjustment that I don't know about? A secret screw, perhaps? A place to hit the thing with a hammer? Or should I just throw up my hands and buy a P5, which I'd prefer not to do until I move?Thanks for any help you can give me with this.
-- Howard