Grinder got wet
Milwaukee grinder got left in a heavy rain. Not at all my fault. (Totally my fault)
How long to let it dry and air out before I risk running it?
Edit: thanks for all the replies guys. I'm in Thailand and our "left in the rain" is like "left in the shower while all the players in an NBA game took turns showering one after another", but it's had a few days. I'll just put it back in rotation and see what happens.