^^^^ What he said.
I only use my torque wrench on stuff that I know is delicate or that I want to get just-so. That list as as follows: anything on carbon bars, steer tubes, etc., the pinch bolts on integrated-bb cranks (I pulled the threads out of an XT one WITH a torque wrench once - Shimano subsequently went from 15mm bolts to 19mm), crank bolts on square-taper BBs and the cassette lock-ring.
Everything else I just do by feel and don't have a problem. But I'm very experienced and for whatever reason seem to possess a naturally-high mechanical sensitivity. He's damaging multiple parts. He needs a torque wrench.
Originally Posted by
mike
You don't need a torque wrench. You just need more common sense.
Where can he buy that? A torque wrench can teach him how tight is tight-enough. Same goes with troubleshooting. Does it need to be tighter? Well, I'm up to the correct torque, so let's look elsewhere.