ube quilting

here is a sample of a flange. It is a simple strip of fabric folded and sewn into a seam.

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hope this helps. The coffee pot block is about 12" x 9".
peace

EDIT: One other thing about using a flange is that is very useful when you want something narrow and a plain narrow border would be just to small to do a seam with, so the flange alows for a narrow outline of a block or whole quilt or parts of a quilt.
peace