Jasperok,
The B-Nova adapters come in packs of three. The only difference between them is the thickness so that you can adjust the height of the Slot-it guide above the track surface. I recently repaired my Scalextric Camaro TransAm car to use the Slot-it guide using a B-Nova adaptor.
The B-Nova adapters come in packs of three. The only difference between them is the thickness so that you can adjust the height of the Slot-it guide above the track surface. I recently repaired my Scalextric Camaro TransAm car to use the Slot-it guide using a B-Nova adaptor.