just so you (or I !) don't think I'm going doolally, pictures below of the M3 x 35, S/S bolts fitted to my clear lenses -







It may be that, as suggested, there are different metric/UNC versions in use ?

I also wondered, given how soft the brass 'top hat' fitting is, whether the new metric bolts cut their own thread....?

'tis a mystery...... sherlock

James

Aero8 , Series 1 - Boston Green
RR Evoque P300E Autobiography
Smart Brabus Convertible
Monkey Z125