I'm looking to build my own jig using 8020 aluminum extrusion. Cannot find a source online for cones for the head tube, top of seat tube, and bottom bracket. I can certainly go to a local machine shop but I'm unsure of what they will want, will they want a drawing or can I just sketch something out with dimensions. Also what's the best way to do the bottom bracket, with different sizes this could be a little confusing to keep everything in plane. Was hoping to find someone that sells them for framebuilders. Commercial jig pricing is a little steep for a hobbyist, and I am doing Tig so I need something to hold for tacking. Thanks if you can help at all. Al.