I hate to ask a dumb question here,I went through a weird situation this past weekend with the zen 23.I broke 2 pull ropes and on pulled out of the hole in the unit.I was told that to buy either a chainsaw or weed eater rope that was made of some material for strength.I cant remember with all what was going on.Can some of yall shed some light on this and help me out?I also would like to buy a new unit with the rope and all.Do yll know of a good company that sells parts for the ZEN motors?thanks for your help and time-kenny