My rock wasn't quite flat but the rock cuts well. I couldn't bring myself to buy the lapping fluid at the exorbitant price they recommended, but after much trial and error I found that Simple Green concentrated, undiluted with water, worked very well and didn't rust the stone at all. Hope this helps someone else. The pictures show a ridge in the center of the 1000 grit side with a corresponding indentation on the 300 grit side. I used a stone dry to show a picture to illustrate the point.
๐จ Enhance Your Woodworking Skills with PSI Woodworking PKM FLC Maxi Mandrel Morse
3 Review
๐ง Astro Tools 1442 A34 10 24 Mandrel: Top-Quality Precision Tool for Efficient Operations
3 Review
๐ช Weiler 56490 Mandrel Cutter Diameter
3 Review
Merit M 9 2 5 Extra Shank Length Cartridge Diameter
3 Review