You and I have already discussed the issues you're having with the wheel, and I hope you're able to modify it to your satisfaction.
But, the pictures are great and it looks like at least the bengals are thrilled that you bought Max this awesome gift. (Even if Penny is having more fun with it at the moment)
My bengals use their wheel everyday. I have actually removed it from the room twice to let the kittens play on it and I have witnessed the adults get depressed cause it was gone. I put it back right away and they went from depressed lumps to happy maniacs. Guess I'm going have to invest in more of these.
So you really have given them a wonderful gift, that they will enjoy for many years.