When I re-fit mine for the inverted Saito .65 I centered and redrilled new holes for the mount. I punched out the blind nuts and reused them. I ended up with about 9/16" - 3/4" space between the cowl and spinner backplate, but it looks good, and I doubt it will fly different. I have yet to balance and fly it, due to COLD weather, but I will post my results when I do.