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Old 02-04-21, 08:12 AM
Giles Giles is offline
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Join Date: Nov 2011
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Yes. Most things other than the engine and gearbox are BSF.

Itís mostly BSF rather than Whitworth (the fine rather than the coarse thread - and to add to the simplicity a Whitworth marked spanner fits a BSF bolt a size down).

Small fasteners are normally BA - I found a 2BA hex spanner very helpful with some old seized nuts. (And that will I think be the one you struggled with?).

This is helpful - The Classic Mechanic: MM, AF, BSW, BSF Spanner Conversion Chart

There are a lot of 1/4 BSF bolts that take a 3/16 Whitworth spanner - but this shows that a 7/16 AF would fit.
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