So if Cdale did it then drilling a hole and welding an AL threaded tube into the frame should be do able. My current DTs are designed for bosses so they already have a screw thread. I would just have to make sure that the tube was long enough to snug everything tight. I also would probably not hurt to thread a piece of all thread into the shaft just to give it a little more support. I was just thinking that if the market for old steel bikes ever dries up or I see a really good deal on a nice AL bike I would like to be able to do this.