If you are laying under flange of large diameter to cut from a camera from the wheels, as is usually done, will not work: it is twisted. Rescue and cords or braids of twine. I in these cases, apply the following solution. Take a fabric tape and wound it on a conical bucket, which is easy to find the right diameter. Enough to make a few turns on each other, and then twist the ring down: get a ring roll, which would be no worse than the former strips.
S. SHPIGUN
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