Covington's Maxi Laps are excellent units for grinding, shaping, and polishing small workpieces. All models have a cast aluminum body, quick-change aluminum heads (no hole), water manifold, pump, tubing, 1/3hp heavy-duty motor with a carrying handle, instructions, and product guarantee. The aluminum head turns at 1410rpm.
The Glass Maxi laps feature one aluminum head with a steel disc attached. The steel disc allows this unit to accept magnetic backed diamond accessories. The glass unit features a four-step system and includes 1 each 100g nickel bond, 260g nickel bond, 325g resin bond, and synthetic felt discs.
Here's the link: https://covington-engineering.com/content/_pdf_files/5070inst.pdf
Here are some handy installation files for this machine: