Ghost

I just got a used Clayboss wheel and the wheel head has a composite surface. The center section of this material is coming off and I'm wondering the best thing to use to reattach. I'm willing to experiment as I can get a replacement wheel head if needed but would rather try to repair this one first. I've also never seen a wheel head that was anything other than metal. I considered removing it but don't think it's possible as it covers all the way around.