Lets say someone brings you a Toro Walk Behind. It is blowing a fuse when you try to engage the blades. Do you just replace part after part until you eventually fix the problem and charge the customer for all unnecessary parts and labor. I have a mower in the shop and told them that if it is going to cost more then $300 to let me know (thinking $300 would be plenty to fix the problem). I get update calls telling me they are waiting for a part and then that part didn't solve the problem so they are waiting for another part. I finally got a call telling me that they replaced every possible electrical part except for the pto clutch and that I am at the $300 mark now (even though they problem is not fixed) and a clutch will be another $250 for the part only. They said they will help out on labor but even with parts only I would be around $450 with a clutch. I explained that the clutch on it now only has a few hundred hours but they insist everything else has been replaced and the clutch is all that is left. I told them that if he can guarantee that bit will not cost over $500 to proceed because I feel $500 is fair for the clutch repair if that odes solve the problem. In which case the dealer will be doing the cost eating. But I don't understand why I am at the $300 mark now when all they have been doing is replacing unnecessary parts and the clutch might just end up being another part I do not need. The real question is... Do you just keep changing parts at the cost of the customer hoping to nail the problem? My father is a retired auto mechanic (owned his own shops) and said he would have never gotten by with charging a customer for parts they never needed. He said he always ate the cost of the part if non-returnable and put it on the shelf for stock hoping to need it someday when he could justify charging for it. The guy handling my mower has been very nice and picked it up and is delivering it because he lives in my neighborhood(dealer, 2 locations are 30 minutes each direction). I met him while demoing some of his mowers. He is a Toro, Exmark and John Deer dealer and I have heard nothing but great things about their operation. He has offered to eat most of the labor to keep the total under $500 but I am wondering what will happen if the new clutch does not fix the problem. Do I just keep paying for these parts while they trouble shoot this problem?