I get the forum info every day but haven't posted anything for a long while mainly because I haven't had any problems with my original ( sold) or the 129 that I have now...until now. The mule drive roller isn't keeping the belt tight. I assume it's the spring but I can't find any information about buying and replacing the spring. I jury rigged a piece of angle iron to hold the lever out to maintain the belt tension but I'd like to fix it properly. I'd also like to know if the knob that locks the deck lifter in place is available or some kind of fix is out there to hold the deck in place. Any assistance is appreciated.....Thanks Tony