The Club probably holds the patterns for these cast alloy silencers. I think they were first reproduced back in the early 70's (when Barry Bailey was prewar spares secretary) and were available in 2 sizes. In recent years, tighter restrictions regarding the control of hazardous waste, etc. has led to the demise of a lot of the small casting companies that the club used for their small batch work, resulting in a hold up with supplies. I know the committee are trying to clear the backlog as the new spares secretaries settle in and find their feet.
Regards,
Eddie.