Janome 15000 with Quiltmaker upgrade


I've found these feet and stitch plate for Janome 15000 and I don't know what they are for.  The feet are QR, &  PD-H.  The plate has 3 holes and I'm not sure what this is for.  I have a single hole plate, an HD plate, and another plate with one large opening.  Guess I need to use my Janome more often.

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