Old alarm clocks and many doorbells and telephones emit a signal due to the blows of “hammer” metal hemisphere of the bell.
If you are annoying it’s pretty sharp rattling, stick a bell in place of hitting it square of adhesive tape or medical adhesive tape device will beep “whisper”.
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Blanks of sheet metal with a thickness of 3 - 5mm will be more accurate and easier to bend at home if they are pre-trimmed along the fold lines using the grinder (and if the workpiece is...