I have had a couple of .22 cleaning rods for many years, One Hoppes and the other I don't know. I got some replacement tips for them, brush, jag, slotted patch holder etc, only to find they did not fit. They were standard 8-32 thread. Thread on the old tips was somewhat smaller, but larger than 6-32 ????. I found that I could drill out the threaded end with a #30 drill (#29 is the proper tap drill for 8-32 but since these were aluminum I wanted a little more thread depth) deep enought to get the length of thread needed and then retap with an 8-32 tap.