Bugger! I’ve disassembled it and no loose wires. Magnet
is in place. Spring is still there,although it sort of
popped out when i opened it so I’ve no idea how to put
it back. One of the wires appears to be tied around
another wire.
Maybe I just have a dead unit. Bugger ebay! Should
have bought from a shop. My first experience with
ebay too. 🙁