I have had cotter-pin failure several times in my Mk-9 gearbox, on a FF. I spoke with Lee at WRD, who noted several others had had the same problem over the last year, and suspected cheaper material in the pins. {I got mine from Pegasus] I recall that when I got the box, it had double-nuts [I assume you torgued the first and cinched the second as a jam nut] instead of Castellated nuts, but Richard Morgan Racing changed it to the more standard setup years ago. The problem with the cotter pins began 2-3 years ago, long after the change. Does anyone know of a source for good cotter-pins, which are stronger {carbon st vs stainless} or know anything about the double-nut setup? [I can't recall which shaft had that, at the moment. The top shaft seems to be the failure area, I think.]
Thanks for your input.