I bought a GMC 7 1/2 inch compound miter saw at Lowes three or four years ago. It's great for small trim, etc., but now I can't find a new blade for it. Lowes doesn't carry them any more and I have tried every hardware store & tool store on line. GMC only wholesales and doesnt sell parts. The USA phone no. in the owners manual has been disconnected. They wont answer my email. Can anyone help?