Originally Posted by uncle al
it is a delicate go gently with it , gentle and patient, and the ball bearing should be on top of the spring when you remove the brass plug on the bottom
Hmm - am thinking we have wires crossed...
I undid the four screw on the corners of the cover , this then lifted off leaving the spring in the housing ( on the carb) . The blue plastic 'bit' that is supposed to move, but isn't - was stuck fast in the cover.
Blue plastic bit ( plunger ? ) has a needle on the bottom that clearly drops into a 'hole' when priming and it also holds the diaphram between two plastic washers - which force the deiaphram up/down and suck fuel ...
Some gentle (ish) tapping removed it and freed it
. Starts first time now .. just need to get the impellor , find some water and off we go !