Hi: I got my first ZTR and even after asking the salesman if they adjusted the deck as part of their "prep before pick-up" he said sure, sure, etc. Well I'm not surprised that after I got it home to find that it was not done. My question: after breaking loose the jam nuts on the bolts that you adjust to raise or lower the chain on each corner...should it be free enough for up and down adjustments? Or in my case I had to loosen the big bolt that holds the top end of the chain to the bracket/adjustment assembly. Otherwise while tight it would not allow it to slide up or down while turning the adjustment bolt. Is this bolt intended to be drawled up tight after adjustment is made or left loose enough to allow for easy adjustment. I know this will sound confusing to anyone who don't have this type of adjustment. Thanks for any help on this subject.