I've bought drum retaining screws recently from my local factor, I'll check they are still available next time I'm there and get a stock if they are on the way out.
The drum retaining screws would they be the size as used on a stag,if they are any of the stg suppliers sell them
Drum retension screw is fitted across the range of Triumph's - TR2/3, stag, herald, GT6, spitfire,2000 / 2500 and of coarse Dolly - part No. V5435 qty of 4 required.
RBros & JPaddocks have them in stock if anybody whats any.