Ours developed a cracked floor flange around 1 of the bolt heads. Emptied/flushed the tank, removed commode, and decided to use a metal repair flange and rubber seal.
The repair flange is pretty stout metal for the repair but I wanted to mount the commode base on something light and bulletproof to eliminate the base from ever rocking on the flexing wood floor with soft linoleum overlay.
After the toss-up between aluminum or UHMW, I chose the latter. I had a 12"x12" tile of 1/4" UHMW, templated the commode base then added 1" more overall larger, and cut. Cut the inside out for flange and rubber seal, then mounted everything back together.
Now all that's visually different is commode has a 1" black ring around it's entire base and is 1/4" higher....no way it will become a side-rocker again with metal flange and entire base that is bulletproof.