Thump when slowing down

[Trophy885]

Hi Guys and Gals,
I'm pleased to report the "thump" has now disappeared, after I replaced the small vacuum lines, and removed the PCV through which I cpould hear was an air leak, subnsequent dissembly revealed a diaphragm in two halves, so two questions, does anyone have a spare?? I don't want to go to the stealers, as the valve is £74!!!! Failing that I will be in contact with our sponsors, fine body of men they are!!
Later on, I may try a repair to the diaphragm, possibly bonding a condom to the existing halves, as it is an all but circular split. I have seen this repair before on motorcycle CV carb diaphragms.
I suppose the moral of the tale is, before you spend big dollars, have a check around using some old fashioned nouse!

Best regards to all.
Steve