I had a similar problem with the deck on my 782. It never really stayed centered and one side would drop off if I hit a bump hard. Over time it got worse. I tried bending it out a little but then I had trouble getting the pin to catch. Since I rarely take the deck off, I ended up replacing the pin and spring with a long shoulder bolt and that took care of the problem. It takes a little longer to pull the deck off but until I do a full rebuild and see what the issue is, it works for me.
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