I have the model 13 tornado, what do you mean you need the 500 dollar torque wrench? I really have never had a problem either, just had to retap a thread once. I understand using a torque wrench is always a better option, but why is it a must have in this application?
It happened while I was using it unfortunately. It was chipping fine and then it started rattling hard to the point where the tires were bouncing off the ground. It ate its own blade which wrecked the drum, the drum's axle and the bracket holding the axle. We found little pieces of chipped up blades in with the chips.
I had a throw thru drum chipper detonate one day. The anvil came up and hit the knives. It threw the floor of the chipper halfway thru a V8 engine. Oil and antifreeze everywhere in the customers blacktop driveway.
No I hesitated and rborist1 scooped it up. He should be picking it up shortly. I'm still humming and hawing and just recieved a really good offer for a new blizzard 14. I think I might by the $500 torque wrench