Magdyno /magneto /distributor timing chain, 110037 [nominal 3/8 inch x 5/32 inch, actual 0.375 inch x 0.155 inch] , 42 pitch, Renold's Synergy endless. The original magneto chain fitted to Norton Model 7 and all Norton twins from 1948. All Norton singles magdyno chain < 1948 with 15T sprocket . Norton twins with distributor Original part number D12/113 ; 18257 3709; A2/113
