I have always just hand filed every chain, and can do a pretty good job in my opinion. Sadly, hand cramps are taking a toll and it takes me almost an hour to sharpen a 16" chain now. I was never a fan of grinders on a chain, but the little rotary type grinders look pretty easy on the metal from what I have seen. Any experience or recommend something else ? $100 aint cheap but neither are new chains that get hung on the wall after they get dull. Thanks.