One of our new brass wire wheels wouldn't mount with our wheel flanges. This insert was made to set inside the concave of the brass wire wheel and allow our existing wheel flanges to push up against it for mounting. As is, this is made for a 1/2" arbor and for the specific wheel listed below.

Weiler 6" Narrow Face Crimped Wire Wheel.0118" Brass Fill, 1/2" Arbor Hole ( https://www.amazon.com/gp/product/B01022V4L4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 )

We printed this in PETG with 40% infill.

I have uploaded the STL as will try and get the TinkerCad file imported so you could modify it to fit a specific wheel you may have or to change the arbor size. Hope it helps someone out.