A good fitting spring guide that is custom machined from
steel , brass or delrin works really well .
Alternatvely you can do a shrink tube tune , using 5/8ths
electrical shrink on the guide after spreading some epoxy on the guide , then place in a 150*c toaster oven ..with the guide on its base for 20 min . Then trim the end and lightly moly and assemble.
Frank.