When you do not have a suitable spanner to Unscrew the hex-head bolt will help out any screw with two nuts — preferably square-shaped.
Recommend to read
SOLDERING IN THE ROLE OF MARTIN
This advice will be useful to those involved in the drinking of low-melting materials. Take a spare soldering tip high power (over 65 watts), flatten the end and rivet it to a steel...
TO REPLACE THE SHOVEL
From the depths of centuries, the shovel has reached us, to which V. Dal, the creator of the Explanatory Dictionary of the Living Great Russian Language, gave an amazingly apt definition:...