I have a WW built corvair that was built about 5 years ago. It is still new, never installed. It does not have the additional bearing. I have a 3 blade Warp Drive prop which requires no extension. How much would it cost to send it back or have the addition bearing put on and is it worth it? My plane is a KR2Super-S 17.6 feet long. Thanks, Pappy pap...@sbcglobal.net Texas Super-S