I have made lots out of Aluminum flat bar. Fast on the cnc mill to make, and nice for when your working with stainless steels or anythign else you don't want to possibly mark up. Thick Aluminum angle also works good with some slotted holes milled in it for setting things up.
I will have to make a few of them out of Aluminum drop I have in the garage. Probably make about 10 of them. The 90 degree angle pieces is a good idea that should fit on the 1in thick drops I have.
Knocked out 25 blanks short bolts and will turn 15 more. Depending on material left I may turn some long universal ones. Going to make enough that I never worry about running out. Each one is about a 3.5 minute cycle time. Lathe could be pushed harder but no reason. Wish I had a tool changer, bar feeder and mist collector already. 40 would cost about $2200 vs $150
Also picked up qty 2 - 5c step collets for holding the bolts inside the mill for drilling and tapping operation plus the holes for the bearings. Should be alot better than my shitty threaded rod in the 4th axis.
This weekend I'll have more pictures showing the lathe setup and maybe a video or two. Also placed a order for a Caswell mega black kit but nothing has shipped yet.