Early Norton domed and polished gearbox nut (5/16"-26TPI) as fitted to the endplate of all upright Pre-War models and pre-Featherbed Manx models.
7 required, or 3 when fitted to the laydown style (pre-AMC) gearboxes.
Norton Commando double gearbox primary adjuster assembly/kit. Options are availabe to suit standard engine plates as well as alloy plats that are typically 8 / 10mm thick, select the option you require.