Postscript: The problem was that the top thread was heavier than the bobbin thread. I've since changed the top black thread to a different weight black thread which is the same weight as the thread in the bobbin. The resulting quilting has not shown the kind of thread blobs as seen in the above photo.
Postscript: The problem was that the top thread was heavier than the bobbin thread. I've since changed the top black thread to a different weight black thread which is the same weight as the thread in the bobbin. The resulting quilting has not shown the kind of thread blobs as seen in the above photo.
I didn't know that the different weights of thread would cause that. Good to know! Looking good. My backs never look as good as yours!
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