I use a high speed air grinder with 1/4 inch arbor, but a Dremel tool with 1/8 inch arbor is fine, as both run at around 20,000 rpm. A high speed drill motor or drill press works fine but takes quite a few minutes of polishing instead of seconds.
1. Split a rod lengthwise with a hacksaw, about 1/2 inch if 1/8 diameter, 3/4 inch if using 1/4 inch rod.
2. Into this slot insert the end of a strip of cotton or linen rag. Nylon, rayon etc melts from friction with the high speed tools but is OK, and wears longer, if using a drill motor / drill presses (low rpm). Wind on enough cloth so the the rod is well padded.
3. Charge this bob, or butterfly with Dico stainless buffing compound, which is available at most large US hardwares. Stainless refers to the grit, and this grit works better than anything I've tried. Automoble buffing compound will work in a pinch and if used is just wiped into the rag with fingers. The buffing compound is applied by running the bob against the compound at high enough speed to melt compound into the cloth. The tube of compound has simple directions written on the outside.
4. The rest is straightforward. Just run the bob in the sizer or hole to be polished till the finish looks like a mirror. A few seconds with high speed grinder, several minutes with slower rpm tools.
The reduction in effort required to size and reduced strain on your sizer will make the effort of polishing well worthwile. I polish all sizer that I use before ever trying them, but some are so bad when new that sizers are broken and bullets stick in the die so tight they can hardly be brought back out. Polishing is mandatory on such rough ones.l
Star sizers are very precise and no further alignment is possible. With the other sizeres, size your first bullet nose first so you know the nose portion isn't sized off center. Push this bullet back into the sizer base first with the sizer die retaining nut a little loose. When the bullet is all the way in, snug the retaining nut to lock the sizer into the most precise position possible. This doesn't give a lot of adjustment. Only the amount of play between die and lock nut.
