Yep youve got it, the sender is basicly just a hollow brass (or copper?) tube with a capped end and a couple wires inside with a nut sweated onto the outside. When i tried to remove it the nut came away from the tube and screwed out leaving the empty tube stuck in the head. Will load some pics soon,
cheers
joel

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This is the part. It is a slide fit into the head. Sometimes the head gets slightly corroded and so it sticks.

You can get to the bottom of the sender through the thermostat hole. Use a drift to try & push the sender out the top. Another way is instead of an ezy-out,use a large tap into the sender for a few turns, this should break the bond between the brass sender & the aluminium head & it should pull out. If none of these work, try cutting down the inside of the sender with a sharp chisel & fold the sides in on itself & it should come out. I've never had the last fail (yet) so I haven't had to figure anything else yet. Just be careful with the thread when using the chisel.

Nice one b310gx, some very good ideas there, cheers very much.