Well, to all those who are still interested after my rambling post yesterday, the new spacers I ordered turned up (forgive the pun) in the post this morning and I'm pleased to report that they do the job exactly. A bit sloppy on the id but should be OK. I had to buy a min order of 10 and only needed 1 so I've now got 9 going spare. If there are any Burgess BBS20 owners out there who would like one or two, please get in touch.
Thanks again for all the help and constructive messages.
Cheers Pete