They kinda click in and open up - wedged in a bit like an arrow head. If you are knocking them out, careful you don't kink the bonnet under the jet . If you wanna do a neat job you have to push the side jaggy bits back towards the nozzle then it should come out quite easy (try using a pair of needle nose pliers to get in at them to close them in). Are they blocked or are you upgrading them?
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