When the dust cleared, I ended up with 3 grinders-- a Lehnartz, a KyM, and a Dienes. The Lehnartz was in the worst shape, so it was picked as the first candidate for resoration. The burrs looked rusty and dirty but after a soaking in Full Circle equipment wash, the metal came out looking like new. Not rusty at all, just caked on coffee grounds. It had a ball bearing so it and the rest of the moving parts got a light coat of McGlaughlin Lubricant. I am going to try the grinder out later this morning.