I thought that was a great idea, but since I am at work ... I tried to make one using some (who knows what) kind of metal tubing we use on our pianos (get off me its Friday )

But it is quite a bit larger than the extra t15 bits I had and after trying to get a good crimp on it using the bench vice the tubing just couldn't handle much before ripping all apart

so I cut a section to size, and beveled the end with a belt sander, using the concrete floor and a hammer I followed that beveled edge holding the tubing at an angle and tapped on the other end while rotating which narrowed the tube down to size quick

I taped it off and flood flilled the tube with some hard core industrial epoxy, Ill let you know how it works on monday (this stuff takes a minimum of 48 hours to set)