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How do i repair a loose grey knob on worcester bosch 28CDi?

The grey knob which has to be turned anti-clockwise to pressurise the system seems to be broken as it is very loose and does not turn the spindle to allow water in to the system. How do I repair/replace it?
Mick Murphy, October 2008
Thanks Glen I'll give it a go. Is this a well known problem?

Mick, October 2008
i used plastic metal a two part filler available from motor factors,mix the two puttys twogether, push some into grey nobfit nob to spindle and allow to set.

glen, October 2008
link Click here to see other fixes for Worcester.