Remember that the Lee collet type sizer is a pretty universal die,especially if you have a small lathe or know someone who has a hobby lathe. First deterine the range of bullets you are going to try, and then create a mandrel about 0.002 than that bullet; which sizing will give a weak fit most of the time. If you size some small bullets, you may have to gently pry the collets back apart to go to a much larger one (g) ... this theoretically will not work quite correctly; it induces a tapered sizing ... however, for practical purposes it works quite well.
If you understand how this die works, you will find that you can make the mandrels simpler by just dropping a correct diameter rod down in the case and run it up in the tapered squisher. ie, deprime seperately, then you won't need threads on each mandrel, or the decapper pin.
( might be of interest .. .in our shop, we use lots of 5c collets, I have a manual 5c collet closer I reserve for trick reloading, just drop a mandrel rod in a case and drop it into the closer and gently size ... is real handy because I have about 120 collets from 1/16 to 1.125 and specials are easy to make from standard blanks available from supply co's. )
just some thoughts. oh, the closers are cheap from Harbor freight, etc. and are closed by a little handle on the side. The closers weigh about 5 lbs, and are very handy to use as a bench vise, etc.
ken campbell, in a pinch in Iowa