600s are way more complicated to work on than the 22xx and 13xx guns, just look at the parts diagram. Lots of little fiddly bits in places hard to reach. I think there's a special tool or two needed as well.
Tim just rebuilt a 600 and an old 400 rifle for me, did a fantastic job on both. As far as I'm concerned, he's the go-to guy for vintage Crosmans.
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