To further move this thread and invite other's home made tools here's a couple of braze on bit holders.

The tinker toy version is my earlier attempt. I have 4 of them. No special machines to make these (an important element for many). There are series of bolt together holes (added after this shot) to allow adjusting the various locations of the bits. I use a hose clamp to secure these to the frame.

The sleeker version is inspired by the Sputnik ones. I made two different shaped end links that press onto the braze on bit. Vee grooved and knife edged. I have 3 of these and use either hose clamps or spring clamps. Andy