Bodged something together yesterday: 2mm hole drilled in tip of 6mm rawl plug, lashings of glue - nice & solid, functionally equivalent to OE, if not as pretty.
Crappy 2meg phone pics, but ye get the jist of it...
I'll keep browsing breakers for a proper replacement, but I'm happy with this for the foreseeable future.
Thanks all, specially Dancake.
Mark