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Thanks everyone. Yes Roy that would certainly do the trick. Will have to look at the economics!

You are right xy. Not heard of that ploy before but I think my son would suss me out!

Thanks Dee, You maybe right about the thread. I do have the 4 jaw chuck. I had a quick look at it last night and thought I would not be able to get to close small enough. The pieces of bone are 6/7mm square and have to be turned down to a 3mm dia ball and then down to a 1.5mm peg. The annoying...

Thanks Chas. The Jacobs chuck has a 1/2"-20unf int thread, so ideally a M20x2 internal x 1/2"-20unf external would be the answer but as you say not a readily available item. I worked in the engineering merchant trade before I retired and spent a lot of time looking for a solution and thought I...

Hi all, First visit so here goes. I have a Clarke lathe with what I believe is a m20 x 2.0 pitch male stud on the drive side. I also have a 1/2" capacity chuck which is fitted with a No 1 mt arbor. My question is how do i attach the chuck to the lathe? A friend welded a m20 x 2.0p nut onto a...