Thanks for the tips gentlemen. The lampshade trick sounds like just the job. I'll post the results after I've tried it.

Many thanks.

I have a new HJ Poet which I bought online and despite measuring very carefully before ordering, I'd say the inside circumference has turned out to be about 1/4 inch too big. This has the unfortunate effect of making it fit a shade loose and slide down on top of my ears. Do any of you experts on thi...