whosyrdaddy
Member
- Joined
- Aug 12, 2006
- Messages
- 332
The blades fit into grooves on the shank. The grooves are tapered and get shallower toward the back of the shank. The back of the blades are also tapered to match the shank so that cutting edges are always parallel to the axis of the shank. Picture two cedar shims sliding against each other in opposite directions.