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Lathe collets in the 8mm can come in various lengths and with different threads. You need to make sure you get the correct ones otherwise you will find your drawbar wont reach them to tighten or it will be too long and they wont tighten. Having spent an age studying used collets on e-bay and the prices they make I would seriously consider the collet sets supplied by “sincere clocks” on ebay. Their new sets of collets work out as cheap, if not cheaper than buying used and they come with a matching drawbar. David P is the person to ask as I believe he has purchased one of their lathes.