Carefully cut a circle from the cardboard using scissors is very difficult. To help in this work can usually tsyrkul fixed in his foot, as shown in the figure, a razor blade.
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FOOT IN AID
To remove or hang on the door hinges alone — for many, this becomes an intractable problem. Make the device shown in the figure, and the case will move forward.
AT A GIVEN DEPTH
Working with woodwork, often having to make cuts at a certain depth under the grooves, joints. If they have to perform a lot, they should set on the saw kind of stop depth. He is going...