Apologies for the delay but the ABBA stand with a bike on has been wedged in the garage covered in stuff, awaiting the fitting of solar panels, with all the electrics going in the garage.
The castors were obtained from
Atlas Handling (UK) Ltd
The Castor Centre
Palmers Road
Redditch
B98 0RF
Castor Details
4 x 80mm Medium Duty M12 Bolt Hole Braked castor - 100kg capacity - W80DRBH12PNOSWB
I also separately ordered 4 x 32mm long M12 bushes and some washers, to enable 360 degree rotation, as not all the originals did that. The slope on the castors to the brake operator, helps them clear the stand frame.
Paul