FS Mk Castellated Pinion Shaft Nut

LH thread 1 5/16" castellated nut for Hewland or Webster Mk 8 or 9 pinion shafts. I've recently acquired another in a box of spare parts, so this one's for sale. Never used. Pegasus item http://ift.tt/1NdlamW is $65; you can have it for $45 plus $5 shipping.