One is sprung - I can fit them either way round as the hubs interchange.
What is it that makes changing the speed easier with the sprung cone on the motor Bill?
My pulleys would only really fit well if the drive pulley (originally the one with the centrifugal weights) was fitted to the motor, and the originally sprung pulley on the intermediate shaft.
I couldn't see a way to control the spacings of the motor pulley - I looked at various lever mechanisms. So instead, I swapped the spring onto the motor pulley and used a pull rod, down inside the centre of the intermediate shaft, to control the spacing of the driven sheaves.
BTW Since the website pictures were taken, I have increased the tension of the spring and fixed the motor adjusting plate rigidly, to reduce vibration (you may find those rubber motor mount will also cause vibration/ resonance). The six screws that hold the extended motor shaft allow me to dial it in, to run as true as possible on my worn motor shaft. The nut on the extended shaft is a LHT to stop it undoing under load.
Bill