Standard Modern help
 

I recently purchased a Standard Modern 10'' "utilathe" and the double pulley that goes on the motor is missing. I have searched around and cannot find information on the size of this pulley . does anyone here know the diameters on this pulley ? I also own a 9'' standard modern , the motor is mounted on a swivel plate that releases belt tension , does anyone know if this was the same arrangement on the 10" ? the motor is at present bolted directly to the rear of the bed.

Thanks in advance for any help