I'm about to build my first jig using 8020 extrusion. I'm looking for 3 cones for holding the head tube and top of the seat tube in the jig, similar to this http://www.flickr.com/photos/mrwright/3747714619/ I would guess that the cones can be steel, brass, or aluminum, tapered from about 24mm to 42mm. Having them tapped M6 or M8 would be a huge plus. My only machining capability is via a drill press and a bench disk/belt sander, which ain't going to cut it for what I need.
Does anyone here know of a commercial source for something like this? I found these http://www.cmmfixture.com/components...llaneous/cone/ but they are too small.