The chuck and collets were acquired separately from the spindle and DO NOT exactly fit the drawbar with the exception of the #8 collet. Apparently, all 8mm WW collets are not created equal!
Although the threads of the collets and the Jacobs Chuck appear to be the same, they have slightly different pitches. Some research on the internet has revealed that there are indeed different 8mm thread pitches for WW tooling. The item "Unimat Emco DB200 Lathe WW Watchmakers spindle part#2800+7collets+Jacobs chuck" is in sale since Tuesday, November 30, 2021. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Workholding & Toolholding\Toolholding\Spindles". The seller is "mrmickeyg" and is located in Pottstown, Pennsylvania.This item can be shipped to United States.