I've been reading and watching this thread for a few days and dang it it didn't get to me. Years ago I used to take my chains in to have them cleaned up. (I like rocks) But after a while it seemed like no one could grind a chain anymore lots of buns and obviously different length teeth so I quit dropping them off and just relied on hand filing. I can file pretty darn good but over the years the hands have decided that they don't like filing as much as they used to. My son is a tree trimmer and files a damn sharp chain but he isn't around a lot and can't file a milling chain to save his kester. After checking the forum the other night I checked a swap and sell site and there was a saw chain grinder. long story short I picked up a brand new grinder for $50. It's just one they sell at Northern Tool but I figured the price was right and I like to learn before I invest a lot of money. I putzed with it a little cold in the garage tonight, It's -18 outside and only 25 in the garage. I will have to fire up the heater to play more with it. I am sure I will have a lot of questions as I try to figure this thing out.