Foam Tyres

[h0m3sy]

This is probably a daft question, but, is there any way I could fit a 12mm hex to the rear wheels of my 210 to allow me to run Contact Foam Wheels and Tyres. Our local TC club are allowing buggys to run this year but no pin or spike tyres are allowed in case of damage to the prima-felt carpet. A fellow buggy driver turned up last week with foams on and destroyed the field. He had got 1/8 Contact foams and fixed them to his Schumacher wheels somehow. I thought it would be easier if you could change the wheel hex meaning they would bolt straight on ?