I just bought an old RCBS Jr3 single stage press and the priming arm only came with the large primer set up. I see that RCBS has a universal priming arm out that would fit this press but I don't want to spend $18 plus $10 shipping when all I need is the seater pin,cup, and spring. I also found that these replacement parts for the new arm are different. The pin is threaded so that it screws into the arm instead of using the set screw like mine. So.....does anyone know of a place to get old style parts or if I could just put the threaded pin in mine and tighten the set screw? Sorry for being so cheap but I don't want to pay as much for the priming arm as I did for the press. Thanks in advance.