Getting ready to start pen making. Going the TBC route with carbide tips out of the gate. Question on TBC bushings. I get the point of stretching the brass without bushings, but I don’t want to buy dozens of sets if I can avoid it. So can I just get one set of bushings per tube size and turn using a digital caliper for the ends? In this scenario I would get the smallest bushing per tube size I could find. Being too cheap or issues with the approach?