I completely dissasembled the quill and spindle on my Strands drill press this afternoon. As I supposed, the spindle nose bearing is a massive tapered roller bearing, about 2 3/4" X 1". It won't pose a problem using it as a mill. Also, the end play in the spindle is adjustable and can be preloaded. I have also figured out a very simple way to hold the collets in the spindle with no extension or sleeve as well as a way to easily remove them. It resembles the drawing I made in the previous post but no adapter sleeve is necessary. I will test it when I have the collet push clamp made by simply holding some work in the vise and rotating the table to mill a part (facing cut). If that works to satisfaction, and I think it will, then I will build a table. One milling machine, coming up.