On 2006-03-19, biig > wrote:

> Patches, our county library has a type of step stool that has hidden
> wheels, but when you step on it, it drops a bit to stabalize and doesn't
> move.

No doubt you mean these:

http://makeashorterlink.com/?G2A3242DC

Very common in industrial environments, also. The best of their type,
IMO.

nb