Review on Upgraded Workbench: Industrial Furniture with Enhanced Threaded Features by Richard Cunningham

I bought these wheels to put on an Ikea Omar wire rack. I have a stone shop so I use these shelves to store stone baskets. When my shelves are loaded but not overloaded, they hold up. When I recently moved one, the 2 plastic cups holding the wheels bent causing the shelf to tip over. My solution was to buy some 1" copper couplers from my local Lowes store. Plastic cups fit well in copper sleeves. I added some gorilla glue to hold them in place. I hope this extra metal bushing will prevent future problems. .By the way, I tried a 1" cable management sleeve, but the inside diameter wasn't big enough for a plastic cup.