Small timing pulley and belts

[Terry]

Sorry Mark - not quite. The anchor point needs to match the top edge of the pulleys when the lever is at either end to equalise the strain on the cord as much as possible.

However, the spacing between the pulleys for any suitable lever length can be adjusted, within reason, to adjust the ratio but the scale length will vary to match.

It all depends whether the absolute scale length has already been determined yet but it does allow the design to be tailored to suit the size of tuning drum (or other suitable pulley) available