This is something I saw many years ago, a club member brought it along to a monthly meeting, it was a demonstration of how you can modify the index ring on your machine allowing you to zero adjust with the use of R.T.V. silicone, I think the rough drawings will give you a fair idea of how it works, the right angle holes have the silicone squeezed in and at each end of the holes are close fitting pins, my suggestion would be Delrin, but any material can be used, it should work as long as the pins are a good fit at each end of the holes, the idea is the screw when turned clockwise compresses the silicone,  pushing the plug against the inner face of the index ring,

………..Edmund………..

ortho,

      yes I was impressed he bought a simple sample that he built for demonstration, you know it was at least 25 years ago and I can't remember, but I would think yes, for any application I would think the holes wouldn't be very big in dia and so inject until it comes out solid at the other end, its been so long now he may not have had pads at each end, that idea is what I imagined  how it would work, I do remember he turned the screw partially and it only took a small amount to lock the ring, afraid you would have to experiment a little, if you insert pads at each end do you insert them before the silicone sets up?, or do you wait for it to solidify and then push the pads in?, that is the question?, a couple pieces of metal, round bar and a ring machined a slide fit a couple of holes, try it with just RTV to start with and go from there, I will see what I can do and test it out, you can too, that is of course if you feel you would like to,

……….Edmund……….

Hello Chris, 

     Thanks for the update, then that's where my Member friend must have got it from, sorry I wasn't aware, do you happen to know if it comes under the publishing clause?, if you don't then I will check it out, perhaps a member here on the forum could give some feedback, I don't want to do something I shouldn't, 

……..Edmund…….