ultra small light weight swivel casters

[warren57]

Building a folding pet door to go between my kitchen and dining room. Found a bi-fold style pet door. Would like to mount it to one side of the doorway and allow it to fold store on that side. Now the question... I would like to mount some very small swivel casters under the door so it will roll across the floor and not have the weight suspended from the hinges.
I know I've seen small casters before, maybe about 1/2" wheels. Anyone know where to buy them? Gate weight is a couple of pounds, so very light duty...
Thanks

 

[HIRISC]

Might be tough to find a swivel that small.

How about a ball caster?
http://www.ebay.com/itm/Metal-ball-...328?pt=LH_DefaultDomain_0&hash=item231d579c88

Smallest furniture (non swiveling) type:
http://www.ebay.com/itm/4Pcs-White-...216?pt=LH_DefaultDomain_0&hash=item2a25186d18

 

[Steevo]

Could you put a door catch roller on the face of the non-hinge end of the gate, so that it rolls in an arc?

Something like these:

http://www.amazon.com/dp/B0006ADBNW/?tag=atomicindus08-20