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”.
.
Recommend to read
TO LOOP DID NOT SING
Get a new apartment, faced with such unpleasant phenomena as a creak of door hinges. Tried, removing the doors and hinges lubricated to eliminate the defect, but there it was. It turned...
BIPLANE “GRASSHOPPER”
Building my own plane has been my dream since childhood. However, I was able to implement it not so long ago, although I paved the way to the sky in military aviation, and then on a...