Thanks Eunice. No, I'm not going to drill anything until I know, for absolute definite, that nothing is going to be done about it by anyone involved. The heel rubber is providing a totally solid surface at the moment and I don't see why it won't for a good long while. I am stuck really as I am a leaseholder of an ex council flat and was given a disability grant for this so I can't apply anything really strong on anyone, but I don't give up without a fight, in anything, so won't do until I know I am beaten.