lazer z 60" 25 kohler serial #416565 23 hrs total on hr meter. Have tried and tried folowing directions in owners manual. can get all chains tight except r/r corner. Approx 1/2" -3/4" slack. Loosen adjustment push all the way up still 1/4" off. I have noticed that rear deck pivot rod where chains at rear of deck attach are not at same level. With deck all the way up the top of l/r is parrellel to ground but the top of the r/r is 10 -20 degrees lower. This cannot be adjusted that i can find because all joints are welded. If they are supposed to be equal or could have the chain on r/r streched? No bagger is installed deck has never been stepped on. I am the only one that uses this machine so it hasn't been abused. I feel that i am fairly competent on mechanical issues i work on Jaguars, Land rovers , and Range rovers at my day job but have given up on trying to level deck. My solution was to put a 6mm bolt through r/r chain to pull out extra slack. Still this adjustment is within 4 threads of being all the way in. I hate to not fix this right but have people depending on me to take care of their lawns. Any ideas or suggestions would be appreciated.