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Twinthread
- Thread starter oddball61
- Start date
If you take a fine felt tip pen and place in a groove then rotate screw the pen will mark the groove up the screw but only alternate threads as there are two sets of thread .
The photo would look like a single thread until you add colour to show there are two intertwined threads .
The photo would look like a single thread until you add colour to show there are two intertwined threads .
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