When I went to use the scrap pipe I had to make some cordless drill holders, as pictured in post #1, I found it was just a bit on the small side, so made do with what materials were to be had, like so...
It works well enough, but isn't as universal as the pipe idea - each hole is sized for a particular model of drill, whereas the pipes would have taken all sizes - at least in the cordless I have. I might use some 4" pipe for the air impact wrenches, as shown ^^^^ up there, somewhere. Problem is, there's no real supply of thick-walled pipe locally, and the 4" is actually 115mm - it will do, though.