There are numerous ways to make current, to the ball of yarn did not run away and not out somewhere. The easiest is to put it in a box, basket, or, as shown in the drawing, just the right size jar.
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R/C TRAINER
First, the equipment management model. The use of well-proven systems of the type "Pilot", "Start" or "RUM" is the only (unfortunately!) the opportunity to engage in sectarian terms...
THAN MARKING TREES?
To put digital markers on trees — work is necessary, but time consuming. We managed to make a simple device that allows you to quickly and accurately "print" a mark on the barrel....
