you only use a bobbin genie if you are using a bobbin that is smaller than your machine calls for.
if your machine manual calls for a class 15/A, and you are using a class L, a bobbin genie would definitely be a good idea. (i drop a dime into the bobbin case well when i can't find my genie. that also seems to work.)
if you are using the correct bobbin size then you probably need to adjust the speed at which you are moving the quilt sandwich around under the needle.
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- necessity is the mother of invention. lazy is the crazy aunt.
