As a PS to my response, I forgot to mention that I had a very tidy escort to attend about 2 months ago with flat performance. This had the mighty VV carb on and the blue diaphram had gone (4 x Torx 20 screws). Had one still left in "stock" complete with packaging albeit a bit grubby. No problem there then, but.......I don't have another one in stock, soooooo - wonder if I had better get another one .....just in case