My current recipe is to apply a gob of plumber's mait (I should get
commission on the stuff :-) to taps when fitting, also a washer (bit of 22mm
plastic pipe, sliced to about 3mm length) to centre it better (as you've
done), discard rubber washers and tighten hand tight with box spanner. They
won't resist a determined twisting at first but over the months & years as
the mait hardens it should become pretty solid.
You could cheat and apply gripfill instead of mait.
You could go ballistic and use Araldite ;-)
Bob the builder / it'll cost yer
Bob the builder / loadsa dosh
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