Caster adapters for Like-it modular drawer system

We bought some [Like-it modular drawers](http://www.containerstore.com/shop/storage/likeitModularStorageSystem?productId=10027797&N=80170) from Container Store and there are optional casters for them. Unfortunately the casters are complete garbage, their posts bent under very light load.

I made these adapters for more [heavy-duty rubber caster wheels](http://smile.amazon.com/gp/product/B004KT4POY/ref=oh_aui_search_detailpage?ie=UTF8&psc=1) with steel base plates, which I found on amazon.

Modeled in [Fusion 360](http://fusion360.autodesk.com/about) on a Mac and milled out of some cheap wood using a [Nomad desktop CNC mill](http://carbide3d.com), but you could 3D-print them as well.