Huh? - I'm a little confused here or at least I'm having trouble tellng the apples from the oranges.

My Lee hand tool takes Lee shell holders designed soley for it. These holders have no mounting stem - they are essential the top half of the equivalent shell holder for a press. My RCBS handtool takes any standard shell holder designed for single stage presses. I've never tried installing an RCBS shell holder in the Lee tool.

Also Lee and RCBS and most other mfg's use different numbering systems so that to use you need to match the case your using to a list provided by that mfg. For instance it's not likely that a LEE #3 is the same as an RCBS #3.

One thing that RCBS does is keep the shell holder number uniform across their product line. So that is the case takes a #3 shellholder in the press then the correct shellholder for the RCBS trimmer will also be #3 even though it's an entirely different part - I'm assuming this is tru also of their shell plates for their progressive equipment.