Since you said you wanted a template to draw your quilting pattern, I'm wondering if something like
https://www.amazon.com/Wave-Edge-The...4999943&sr=8-2 would be what you want. It appears to be 3" wide by 16" long, with two different waves. According to
https://www.thewaveedgeruler.com/ it looks like there may be one that is 24" long.
Janey - Neat people never make the exciting discoveries I do.
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