Totally mystified at first - muffe would be socket, coupling, sleeve or similar, so what on earth would this mean? Particulary in this context But just possibly, given that the rest of the text shows signs of being written in NorwEnglish, the original was coupling housing - errouneously traslated into muffehus - now to be translated into English to propogate the error? I realize this is VERY farfetched!