Well you learn something every day... I thought that the rack was mounted with M3s, which would be a bad choice for anything but a show bike Like many I just developed an opinion without doing my homework.

The drop out like tabs- I do like filing (a warding/key hole file is great for this) a slight slot in the tube to help better locate the tube when brazing. Maybe a belt and suspenders thing. But it's these little details that I like playing with when building. No wonder that I'd go hungry were I to rely on my building for food.

Here's a shot of my current rack that shows the tabs I made. Since I wanted to have two struts attach to the tab I wanted the tab to have a triangular shape. What I cut and ground out will get further trimming along one side after the second strut is attached to look better. The tube piece laying above the tab is about the angle that the second strut will be at. Above this piece is my practice for that second strut's shape. There will be some triangulation, a loop idea borrowed from Tubus. I think I need a larger radius the that loop's curve though... Andy