This is very cheap insurance for a new engine, and mandatory if there is any reason to believe there is trash in the cooler. Many new engines have been ruined from the metal filings remaining in the cooler from a previous engine failure. Keeps the rotor from contacting the side housings. Includes side cutting of rotor gear. Does not include cost of rotors.
Price includes machining on both sides of two rotors.
Please call for specifics before sending in your engine parts. Done on customer supplied flywheel.