[DaveG28]

I use the double slipper, and you can't independently set front/rear slip, but they slip independently of each other if that makes sense?

I "think"'how it works is as follows:

The far pulley which runs the front belt is locked to the layshaft, so slips whenever the standard slipper unit slips. The near pulley which runs the rear belt is squeezed between the slipper and far pulley against friction pads, so can slip independently of the other pulley. What that means is you can have the rear slip while having drive to the front, but whenever the front slips the rear also slips (as the whole layshaft does). I hope that's not the wrong way round!?

They can't be set independently as both the main slipper and the pulley friction is driven by tightening the single standard slipper nut! Effectively then when running it you either get even front/rear slip or more rear slip, but it's not too dynamic due to being set through the single nut!