Here is a little gem that I picked up on the bay. These would do for use with the round vented fan openings that were seen in various buildings. they were pretty cheap as well at a pound odds each. cheers toto
Talking of small motors reminds me that I was on the 'Cambridge Custom Transfers' website earlier today, and he has a supply of 'Mitsumi' motors, ideal replacement for the soon-to-be-unobtainable 'Mashima' motors, (now that Mr Mashima has retired and closed the company), double ended shaft so ideal for flywheels, apparently fits standard kit build loco gearboxes, and £7.50 each, so not much money at that price! Keith.