A master carpenter in Knoxville called out my measuring habit, fair enough
I was renting a table saw at a local lumber yard in Knoxville to rip some oak for a built-in shelf. The guy running the shop, must have been 70, watched me mark a cut with the tape pulled tight and the pencil at a 45 degree angle. He walked over and said, "You are measuring twice but marking wrong every time. Hold the pencil vertical against the tape hook and make a single dot, not a line." I laughed it off until the first cut came out a sixteenth short. He was right. That single dot trick changed how I mark everything now, and I saved a whole sheet of plywood on the next project because I stopped chasing fat lines. He also told me to stop pressing the tape hook so hard against the wood, which is another habit I did not know I had. Anyone else get called out by an old timer on some basic move you thought was fine?