Dont get me wrong, I like my MT3 collets and they will clamp down some way, but they wont hold a 6.4mm in an 8mm collet, though 9.8 in a 10 was OK... I couldnt find an 'official' spec on how far they should clamp down and I wasn't keen on tightening up the draw bar any further....

I have been contemplating buying an ER set... but so far the need hasn't arisen.... I have a Clarkson colletchuck that came with the lathe (at least I think thats what it is) but no threaded tooling and what I've seen advertised is expensive...