Hi Brian Your clarification raises an interesting point. The misunderstanding about using a scrap of head tube is not as far fetched as it appears. Although I used VAR cutters to miter top and down tubes, I have seen offcuts of 753 with teeth filed on them like a hole saw used for this purpose. 753 being so hard, they would effectively cut 531 and other normal quality tubing, and of course were very cheap.
Mike Mullett
"The answer to a good steel frame is an even better steel frame". Gerald
O'Donovan
Reading UK