For reliability of bolted connection in terms of vibration under the nut usually enclose a split spring washer: its sharp edges prevent the loosening of fasteners.
If any washers at hand was not there, it can replace the ordinary, but old, rusty. Its rough surface will hold screwed in the nut from loosening.
Recommend to read
THE BATTERY IN THE FRAME
When equipped with a headlight of a Bicycle "Salyut" there is no need to manufacture special container for batteries. It can be hidden directly in the frame, pre-SPAW three elements 343...
LAKE-“TELESCOPE”
Look at ordinary lake that we water the flower beds or the beds in the dry season: its construction, once born, has not changed. But whether so it is perfect that does not require...
