In a message dated 97-02-07 04:43:10 EST, you write: << As luck would have it, I have some 6.5 HDPE tube and the wire handy. I am currently collecting vast quantities of polystyrene foam to make some terminals, hence the question on gluing. Regards, Malcolm >> What about the wreath styro rings florist use. Some are round and look to be useful for a toroid.. You know the green type. Stephen