Here is I a list of all materials I used.

The basis: the Tube The Tube This tube is a aluminium tube with a diameter of 200 mm, length 350 mm and a wall thickness of 5 mm.
The Caps Perspex_1.jpg (59946 bytes) These plates of Perspex (PMMA) are 15 mm thick. Two are turned on a turning lathe too a disc which fits in the tube.
The Battery This battery I liked most. 12V, 7Ah for only 23,-
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