To replace the 4 batteries at a cost of £2.60 (set of 10 Duracell
Procell AAA from Amazon) instead of over £25.00 (for preassembled
copper tube) see http://www.youtube.com/watch?v=TLKq8cnJjeU&noredirect=1
- excellent. Excercise care when replacing the copper cap. Make sure
the spring is the right way round (pointed end to battery) and do NOT
hammer or tap the cap back on. Instead grease the outside of the tube
(where the cap will slide on) then "screw" the cap on with a pair of
pliers. As you do so gently shake the tube from time to time to listen
if the batteries are still loose. As soon as they are tight stop. Take
care not to overtighten and do not tap or hammer the cap on as you
could impact the tips of the positive ends of the batteries so they no
longer protrude (as I did) which will stop the circuit.

Pipalong wrote:
To replace the 4 batteries at a cost of £2.60 (set of 10 Duracell
Procell AAA from Amazon) instead of over £25.00 (for preassembled
copper tube) see http://www.youtube.com/watch?v=TLKq8cnJjeU&noredirect=1
- excellent. Excercise care when replacing the copper cap. Make sure
the spring is the right way round (pointed end to battery) and do NOT
hammer or tap the cap back on. Instead grease the outside of the tube
(where the cap will slide on) then "screw" the cap on with a pair of
pliers. As you do so gently shake the tube from time to time to listen
if the batteries are still loose. As soon as they are tight stop. Take
care not to overtighten and do not tap or hammer the cap on as you
could impact the tips of the positive ends of the batteries so they no
longer protrude (as I did) which will stop the circuit.


Maybe you meant this one??

http://www.youtube.com/watch?v=uiq2M1_DEOo

Bob