Mower hanging down on left

[Tom Evans]

I've got a 1975 1650 with a 50GT model 359 mower deck. When I hook up the deck it hangs down on the left side. I've adjusted the adjustable lift link and still it hangs to the left. After a few days of messing with this, I noticed that the lift arms off the rock shaft aren't parallel. The left is about 1/2" lower than the right. Looking at the 1" shaft that they attach to, it looks like they're held on by roll pins through the shaft that goes through the frame. Is there any adjustment for this, or are the holes for the roll pins wallowed out? Thanks for any help, Tom.