I posted yesterday that I had problems with my 4500, I got the lube out of the reservoir easy enough (boiling water, it dropped right out. Now I can't get the Pressure Nut back up to the top. I've included a PDF file http://www.lymanproducts.com/lyman/b...BC_LS_4500.pdf (well the web site) and the schematic is on page 4 of 6. I tried Lyman this afternoon but they closed 2 hours prior, I'll try them tomorow. Thanks all for the help.