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I purchased my Cowells lathe a couple of years ago and it is very nice. I purchased the DA200 collet attachment from Cowells at the same time. I decided to try and purchase the collets myself and ran into a real runout problem with a set from a commercial supplier (not eBay). I sent them all back. The holder itself was dead nuts on. After communicating with Colin he told me the specs for his attachment were from Ericson. I purchased some original (not new ones from India I think) and they worked fine, I now have a nice set with runnouts in .0005 or less range. I mentioned to Colin back then about an ER 16, not sure at this point I would change.As for the question about the WW set from Sherline. I have a full set of ww and or 8mm collets and use them in the Sherline lathe, they work very well, just do not go much more than - .002" or you will ruin them. I was told I could go -.004 but have not had the occasion to need that. In hind sight a ME Cowells with the 8mm / WW spindle would have fit my work better. The DA system works just fine.Bob
I can only find one supplier of a M14x1 direct fitting ER16 collet chuck and that is RC-Machines in Germany.