10-08-2020, 01:24 PM
My feelings on this are driven, as usual, from a practical point of view. I tend to use metric nuts and bolts to secure wings and body parts that will not need to be dismantled in the near future. Where dismantling takes place more frequently (e.g. rad shell) I use BSF fittings at 5 times the cost. Saves taking a set of metric spanners with me when out and about.
BTW, the original front wing fittings for the vintage cars seemed to be 3/16 BSF dome head screws. The rear wings seemed to be held with wood screws into a steam bent piece of wood, going round the aluminium wheel arch. Probably changed with the AD mark 2 in 1928, together with the introduction of a pressed floor pan and steel inner wheel arches.
Also, 8mm bolts are a good substitute for 5/16 BSF and a 1/4WW spanner "almost" fits!
BTW, the original front wing fittings for the vintage cars seemed to be 3/16 BSF dome head screws. The rear wings seemed to be held with wood screws into a steam bent piece of wood, going round the aluminium wheel arch. Probably changed with the AD mark 2 in 1928, together with the introduction of a pressed floor pan and steel inner wheel arches.
Also, 8mm bolts are a good substitute for 5/16 BSF and a 1/4WW spanner "almost" fits!