Original poster: "David Huffman by way of Terry Fritz <twftesla-at-qwest-dot-net>" <huffman-at-fnal.gov> Here is my rendition of a homemade cap. It is somewhere between an oil and ceramic. The ceramic is the bottom of a microwave oven. It is fairly porous and absorbed quite a bit of the oil. I only wish I had pictures of the construction phase. Dave http://www.tbcnet-dot-com/~huffman/myceramic.htm