It is convenient to create a temporary memo — whether it is preparing the card for your file, or just notes about the latest Affairs in the coming days, or envelopes with letters awaiting answer: they are placed between the turns of the springs (preferably of large diameter). Ensure that the spring does not ride, attach the ends of tin or cardboard cheeks.
Recommend to read
IF THE COPY NEEDS TO SHOOT
Even perfectly executed a valid copy of a military ship or self-propelled artillery loses much if its design does not allow to simulate the use of the main weapon of the prototype. But...
THE WATCHMAN AND ILLUMINATOR
As you know, the greater the number of elements in the design, so it is less reliable. To increase the reliability of electronic devices and selection circuitry. This will be the...
