Well that seemed to have worked out ok, a bit of silicone spray and it fits well..!!

I have just ordered another one:

http://www.ebay.co.uk/itm/GENUINE-BRIGGS-STRATTON-QUANTUM-ENGINE-CARBURETTOR-PRIMER-BULB-694394/151808560373?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2055119.m1438.l9372




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