Rather than guess at what you are doing, call Ishihira-
Johnson and talk to Kevin. You can learn more from him in 15 minutes on the phone than you ever will on a forum. Take notes because he will flood you with information.

May have the spelling wrong but just google crank scrapers and it comes up.

Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston