Answer:
Don't bother fixing it because the Mutsy one is better, safer and cheaper. Mutsy make a wheelie board that comes with an rubber adapter for the all the Bugaboo's except the Bee. The Mutsy is made from metal vs Bugaboo's Plastic. The Mutsy has simply finger operated locks to take on and off vs having to virtually turn the Bugaboo upside down to get it off or on. The Mutsy has an adjustable length and a flat deck with no protrusions vs the Bugaboos fixed length and a massive protrusion in the deck. The Mutsy wheel is directly under the child putting less weight on the stroller vs the Bugaboo's wheel being behind the child putting half their weight on the stroller. And the clincher! It's half the price! Go try one out.