MaxxHaul Steel Hitch Step for 2 inch Receiver

For something we step on, we expect stability. But the dimensions of this square, plastic part that slips into the receiver hitch, are too small to have solid, tight fit, so when you step on it, it moves a little, but it is disconcerting, and not necessary. The part just needs to be slight larger to provide a snug fit. I'll try wrapping electrical tape around it, but it'll probably take a couple rolls. Any other ideas? Sheet metal, wrapped around it, would be an option.