Appreciation post: the old guy at the shop who talked me out of replacing every cable on a tune up
For a long time my standard tune up included fresh cables on almost every bike that came through the door. I figured it was cheap insurance and customers liked seeing new parts, even if the old ones moved fine. Then a retired mechanic named Ray started helping out at our shop on Saturdays, and he asked me to test one thing before swapping anything. We pulled the rear derailleur cable on a bike with about 4,000 miles on it, ran it through our fingers, and it was smooth with no fraying at the housing ends. Ray pointed out that a bad shift usually comes from dirt in the housing or a stretched cable, and both of those get fixed without buying anything. Now I check each cable and only replace what is rough, kinked, or rusted, and my tune up price stayed the same. Has anyone else had a veteran mechanic change how you handle routine jobs like this?
Man, this hits home for me. I had an old timer named Gus who ran the service counter and he would smack my hand every time I reached for a new chain on a bike that just needed a good cleaning. He showed me how to check for stretch with a ruler and told me most chains get swapped way too early. That guy saved my customers so much money and honestly taught me more in six months than I learned in two years of turning wrenches on my own. Sounds like Ray is that same kind of guy for you. Keep listening to him, those old school dudes know stuff that no manual will ever teach you.