Casters for use on bottom of cabinet doors like used on sewing cabinets

Does anyone know who makes or where to get casters like those used by Horn or Koala Studio on their sewing cabinets - The ones that are attached to the doors that when open support a desk flap extension.

I want to use the same style of caster wheel on the bottom of some cabinet doors to help support weight. The attachment section can be visible on the back of the door but not on the front - just like on the sewing cabinets.

I need to support the weight of bifold cabinet doors, as I am told two leaves 450mm wide (total of 900mm) is too much for the hinges.

Any suggestions welcome.


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