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The Filigree Vine is a good way to fill a wide border without over-quilting it. It can go 9"wide easily, with great coverage, no blank bits. Skinny Feather is a nice simple border that looks good quilted, and is quick to stitch.
The bobbin tension on the machine was another thing, necessitating the unpicking of several repeats; the culprit was a tiny ring of grime and lint around the post in the hook assembly. Once that was cleaned out, the tension was perfect. Thank heavens it was such a simple thing to fix.