I am looking for one or two nuts or a supplier of the special nut that fits the output shaft of an ENV75 pre-selector gearbox and the diff flange nut of some Morris and other diffs. It apparently is also the same thread as at both ends of a mini crankshaft. The thread is a 5/8" x 16 tpi Whitworth form and a 9/16 bsf or 1/2 w spanner will fit it. This is a special purpose thread as normally 5/8 bsf has 14 tpi & 5/8 whit. 11 tpi. The photo below shows an example.
Does anyone have one to spare or know of a supplier?
I have noted that the rear drive flange securing nuts on two MG and one Lagonda preselectors I have ( type 75 E.N.V. ) are all 1/2” B.S.F. confirmed in Peter Meyers Workshop Manual for the type 75. I was therefore surprised that the thread sizes on your boxes are a 5/8 size !