i just use the inexpensive toppers from china. depending on size of stone the grit size to start to rough in shape but then i go to 1200 topper then direct to Tin with 50k at SLOW speed, water onlywith drip rate at one drop every 25-35 sec. just enough to make a muddy slur. average polishing time per facet 5 sec. each. although the gearloose batts and others tins work i finally have started making my own. i have several out there and the guys really like it. their like the original 70’s crystalite and mdrs tins being 98-99 percent tin alloy.