30 years at Local 13 and nobody told you about this before? That blows my mind. I've been doing tube rolling for maybe 8 years now and I thought I had seen every trick in the book. The old guys at my shop guard their secrets like they're paying for them out of pocket. Cutting rework to almost zero sounds like a dream, I spend half my Fridays fixing stuff I messed up on Monday. What exactly did he show you, the heat control thing or something with the feed angle?