Many thanks, Dave, for a very helpful answer. Problem solved! Matthew.

Hello. The Century comes with a detachable handle-***-aerial, held in place by two screws. I detached mine years ago, and now want to replace it. I'm not certain if I have the right screws! The two I've found are black, flat-ended and measure 27.0 mm x 2.5 mm. Can someone confirm that these are the correct ones? Thank you. (I promise to sellotape