[Frecklychimp]

Does it have Aluminium bearing holders on the rear centre layshaft?

could possibly have been modified to run slacker belts which was tested years ago by the team,

maybe different gears have been tried too... i haven't seen one modded like that before.

I would definitely leave slipper in and the one way clicker is a good setting to play with on as it adjusts the braking effect/balance and changes off power steering.