Sounds like you have the complete slipper there, they didn't use any slipper pads the spur gear was just clamped in the middle. Back then the slipper was more of a transmission protector rather than something designed to slip regularly, to absorb the shock loads when landing from jumps for example, so running on the spur was fine. Usually a nylon spur gear was used in these, but a tufnol spur should still have enough friction to give enough drive, but unlike nylon spurs you aren't going to melt it if the slipper is a little too loose.
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