In the interest of keeping peace in my humble home, I have been on a search for some time for floor protectors to use with speaker spikes. I have seen lots of choices on websites in the UK, but relatively few in the US, and the one's I've found on this side of The Pond have been expensive. Anyone got a suggestion about where to get some brass or other metal floor protector disks that will support speakers weighing about 40 lbs.?