[quote name='Lozz196' timestamp='1325099496' post='1479886']
I bought a set of these, and simply used self-tappers to screw them onto the cab. I`m not Mr DIY by any stretch, but they`re not coming off of there any time soon. I`ve never had to re-tighten the screws either. Being large and made of rubber, they skim across gravel car-parks, no trouble. They have the advantage too, of two of them being lockable, so the cab doesn`t move about on stage.
[url="http://www.ebay.co.uk/itm/HEAVY-DUTY-Multi-Use-Castors-4-Blue-Wheels-Caster-/120426485789?pt=UK_Musical_Instruments_Rack_Cases_MJ&hash=item1c09fa581d"]http://www.ebay.co.u...=item1c09fa581d[/url]
[/quote]
I've used something very like those, but I bored through & used bolts with large washers on the inside & locking nuts - this makes sure any shear during bumping is spread & the castors don't rip off, or screws rip out.
G.