So for quite some time now my weapon of choice for re-fabricating tile edges and finishing mitred has been one of these. A 120# metal disc, great bits of kit. Recently the supplier stopped selling them and finding a replacement was impossible. I pestered a few companies to get them in, but to no avail. After making an 'off the cuff' remark one day, Alan from @ATSDiamondTools said he had an idea. That idea was one of these. So now they are available again and I for one, am very happy, trying to find an alternative was driving me round the twist! Thanks Alan.