OK, So I now have my saw on the bench and after replacing all three gas lines the saw is now ready to go. So I decide to sharpen the chain. Not a problem. Yet. Anyway washed chain with old mix and set it into my Golly Star. I have had this grinder for over nine years and have sharpened hundreds of chains. With the 1/8 grinding wheel in place I adjusted the head for 60/30. BTW I am sharpening a Husky chain on a 18 inch bar on a Yellow PoulanPro saw. Well going along and after about four teeth the wheel on the grinder let loose. Parts of the wheel fell to the floor. I was wearing my glasses. Anyway the wheel still had well over 70% of life left but decided to let go. This was a wake up call for sure. This has never happened to me before. Just a heads up to others. It could happen again to anyone. The wheel was put on hand tightened with the Allen wrench supplied when I got the grinder. I ordered another wheel from a sponsor on this site. Get this, the cheapest shipping cost more that the cost of the wheel, Ken