Step 4Rolling the Edge
At this point, place the bottle on a flat surface. A soft wood surface works well. The bottle will slightly press into the soft wood giving it some grip. This helps keep the bottle from slipping while rolling.
Tilt the bottle it so that only a portion of the edge is in contact with the wood. Press down on the bottle and rock it in a circular motion; keeping only a small portion of the edge in contact with the wood at any given time.
The second photo shows the rolling in a sequence of pictures
Do not try to do all the bending in one rotation.
Gradually increase the downward pressure on the bottle as you roll it around several times. You want a nice controlled edge without any kinks or variation in flange length.
The third photo shows the flange after rolling
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