Speedometer Cable Thread Size

[Jamie]

Does anyone know the following sizes relating to an Austin Seven speedometer?

• The size of the thread on spigot on the speedometer where the cable screws onto
  
• The outside diameter of the spigot
  
• The size of the square on the end of the cable
  

I wish to make a ratio reduction gearbox and knowing this detail would help.

Regards,

Jamie.

[Austin in the Shed]

3/4" x 26 .I think the drive square is 5/32"

[Chris KC]

The thread is 3/4" BSB.

(Apologies, just re-read the question! 3/4" BSB is the external thread on the brass fitting at the gearbox end to which the cable attaches. I imagine it might be the same at the other end but I can't personally vouch for that...)

[Jamie]

Thank you.