I got an unused Indian sprocket along with some spares I bought....I fitted it to my bike but in only a few weeks the teeth started to break off...It was clear from the grain structure and colour of the material that it was manufactured from grey cast iron, not steel as the originals were...
There are some well made UK manufactured drums available..I usually source them from a local bike shop I've dealt with for years...I can check availability, price and shipping costs for you...Contact me off forum if interested....Ian
