OK to elaborate on this fantastic advice from a team-mate.
Strip the rotar whilst the kettle is boiling so that you can place just the quickfeed face down in the bottom of the kitchen sink.
Place a weight of some sort on the fins/barbs to hold them flat against the sink, pour water straight from the kettle onto the whole lot and then cool with the cold tap.
Instant new quick feed, have done this a few time to keep in good condition, also had a couple replaced by Dye at events when they broke.
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Laters