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With the scriber in place and its lip against the channel, the tip can be pressed against the top insert and dragged around the top opening. As long as the tool's throat extends a hair beyond the insert's overlap, it will transfer the channel's dimensions perfectly. In case you were wondering how to establish the shape of the cardboard template, here's an option. Just remember to extend the cut line by the necessary amount to make the template sufficiently larger than the opening. View Related Article
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