x2 2 on Rotobroch cutters, you can buy individual size cutters several places. Stay away from the light duty Blair hole cutters, not enough beef and they bust easily.
http://shop.blairequipment.com/category-s/25.htm
And try this stuff too, awesome... [img]<<GRAEMLIN_URL>>/worship.gif[/img] Boelube paste on your bits, google Boelube, aviallable lots of places.