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Control lever thread forms

I have some orriginal 1960 control levers and thought to replace the slightly worn and bent bar fixing screws with some from my considerable collection of tatty levers. I was surprised to find that they all are of a different thread form although they appear to be the same. I guess the orriginals are a BA and all the later ones BSF or UNF , Does anyone know what the orriginals are?.

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Generally 1BA as I recall. That's slightly bigger than 3/16 diameter and smaller than a 1/4 diameter.......just to confuse you.

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They're noted as part no.A2/223 in the spares book,Robert, but no size given. That's for the 50's singles.

 


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