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Step 1: What You Need
- A transformer taken out of an old usv. Mine was from a LI 1020BR from Best.
- A stone, a really nice on, mine was from a beach on teneriffe, from my last holidays
- Nuts ...
Step 2: Build an Use It
Get the nuts and put them beside the transformer.
Take one nut place it onto the transfomer.
Take the stone and hammer onto the nut.
Yummy ... :-)
By the way you can use the transformer other ways too ... i use it for welding ...