Thanks Kelly but afraid its not that simple. I don’t know how authentic the strick mechanism is.The backplate is covered with a thin brass cover shaped to the backplate.Should this be touching the plate? This is held on by a thick brass washer with a hole drilled through. The end of the spring goes through this hole with the centre of the spring bent to one side to accomodate the screw.This is all very flimsy and I’ve had to stabilise with a spot of solder.There’s also washers either side of the brass cover to stop its movement when its all screwed up, as its a sloppy fit.Thanks for your comments and I’ll try the NAWCC forum. Peter