So I finally managed to get to Yandles today to buy these jaws. As Duncan pointed out they are not machined (IMHO)to a very high standard, however I decided that buying them with the intention of having to fettle somewhat was still easier than making a set.
I found that the stand up circle on the back of the 4 plates together was to big. The diameter was only just to big but it also looked as if the inside diameter was a bit out too, bearing in mind that they were out with my oneway chucks but were made to fit the Charnwood brand so probably would have fitted them better.
I thought the steel plates may have been of an inferior quality so I bolted them onto my Axminster Cole jaws and tried turning them down with a HSS tool. Not very successful, if I had a Tungsten Carbide tool this method would have worked perfectly. In the abscence of such tool I resorted to using a Dremel with a diamond disc and just grinding the steel away, it didn't need much. These jaws do not come with scews for fitting to the chuck and my ones were a little bit too short despite making the counter sink a little deeper so a trip to the industrial estate and I had new countersunk machine screws which happened to be too long! So I cut them all down to the right length.Once again I agree with Duncan about the buttons, not very good at all but like him I have several sets of different sizes and the thread is the same. On trying it out, by this time it was late afternoon, they appeared to work fine, I turned the bottom off of a 6" bowl no problem at all. I may look for material to make a decent set of buttons specifically for this chuck just so that I don't forget them when demonstrating. Overall quite happy with my little purchase.
