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Does anyone here have these bobbin holders?? I ordered several from Nancy Notions along with other things because she offered free shipping last week. I've been very satisfied with what I have received in the past but for the life of me I cannot get these to stay on the Gutterman/Metrosine spools I have, which is all I use. The picture does show them attached to a regular spool of what appears to be Coats&Clark thread.Every time I push one into either end of my spools they pop right off. Grrrrrrrr, is this something I am going to have to return or is there a trick to these that is escaping me???