As everyone has already stated about the machining bur causing the problem. The newer style blades that actually have a set built in will have less pull. Olsen is called PGT series Pegasus is the advanced geometry series and I think that Flying Dutchman is the silver penguin series. Some of the Dutchman users can correct me if I am wrong, I have never used the Dutchman series yet. Only problem is they are not available in the small sizes that I use a lot of.