Smiths speedo drive thread

[rhyatt]

Hi ,
C15 rear wheel smiths speedo drive.
Does anyone know the thread of the grease nipple please ?
Preferably to buy a nipple or failing that to screw a blanking screw in to keep the muck out
Thank you

[V500]

if it's like most nipples used on BSA's (and many others) it's 1/4 BSF or 1/4 BSCy.

[rhyatt]

Thank you

[Rupert]

Think it may be 2BA

[rhyatt]

Thanks all