Hmm,.. my 1500 is getting re-biased right now. The guy that's working on it said he'd worked on them quite a few times before. The very first thing he did in examining my deck was check the tensioners. Maybe because the bellows assemblies are rare and impossible to replace though. I'll ask him when I pick it up in a week or so. I've been sitting here and trying to think if the difference in height could have something to do with those spacers? Right off hand, I can't but,.. that is the first thing in line from the reel.
I have no doubt that Doc and Co. will be, if they aren't already, the worlds authorities on these decks.