To make required urgently a small spring — not a problem, if there is at hand a suitable steel wire. You can just use a vise and a rod of any desired diameter. The last will only need to drill blind or through hole for entry of the wire end, with the subsequent winding of the coil to a coil.
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BUILT-IN PROTECTION
Not every radio has a built-in protection against so-called "polarity" and incorrect connection to power supply with a known high voltage (which is necessary, unfortunately, to...
RIVER BOAT
This model can successfully build students 4-5 classes. Best to start with the housings. It can be done chiselling from a block of wood or stacked. If the housing is stacked, panel it...
