A simple method of repairing sprockets is to have the original teeth machined off and a matching spocket outer welded or bolted back onto the hub. This works particularly well in the case of aluminium sprockets, for instance TY250A which has a dished sprocket.
Resources
UK page specialising in chains for vintage machines.
109. The Coventry Chain Co., Dale Street, Coventry, have a very comprehensive exhibit of their specialities from an extremely small chain up to large motor chains, 3⅝in. pitch. A driving chain for motor-bicycles has leather blocks and steel side plates for running over a plain belt pulley on rear wheel. A full set of all sizes of free-wheels, cycle chains, rim brakes, pedals, chain wheels, are shown, and a handy little speciality is the patent coupling for motor-bicycle belts which is unbreakable. Specialities in various types of chains for machinery driving are also shown.
1902 Stanley Show in Motor Cycling, November 26th, 1902. Page 275
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