I was lucky to get a Crawford multibore T980 chuck from a friend , I fitted this to a backplate this morning had to take it apart to set up for drilling and tapping as part of the chuck overlaped the mounting holes , interesting construction as the potos show , the collets are sticky and not all of the fingers come out and only eight collets nine in the set , the run out is a couple of thow but may inprove after I have cleaned the collets .