My 24" Rapco carbide chain is in need of repair. I have 6 broken cutters and only about 1/16 to 3/32 of carbide left on the good cutters. Is it worth fixing. I think new cutters are $7 each. How small can I grind the cutters? I don't us it much because it cuts slow and fence wire in wood eats it up. The last go round with it I found 10 inches of concrete in the middle of a log.