Just bought a Hustler Z and I have been using it for 3 days. I like the mower, it's fast and gives a great cut. My problem with it is the belt tensioner, it keeps on misaligning, I had to unscrew the silver metallic knob with 2 plastic guide with an allen wrench to realign it. So far it got misaligned 5 times. Is there anyway to prevent this from occurring again, it's getting to be annoying. Other than this problem I am pretty satified with it and I am planning to buy another one. Need a reply ASAP. Thanks!