On 9 Jan, 08:51, Mike Tomlinson wrote:

Mine (a WB Greenstar Junior 28) does allow the plastic key to be pulled
out. *It has two O-rings on the shaft which make it difficult to pull
out. (does yours go in the bottom of the boiler, pointing down?)

You could do worse than check with WB technical. *They have been
friendly and helpful on the two occasions that I've called with a query.

Thanks, mine is the same - I managed to remove it now with tenacity,
determination and patience.