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The concept is excellent. Unfortunately, the needles provided broke at the stem on first use. Quality of needles must be poor but the positioning and style of the chuck must also contribute. The cover for the bobbin cavity (itself of neat design) is of an incorrect size and much too flimsy. It (the cover) and the bobbin fall out in a most inconvenient way.
Sorry folks. Though well made , to back up line ( and you will have to ) you can’t because of location of spool. I do have an external spool awl that I have had for decades, just need needles. Made in USA but I don’t know if it’s worth returning. Keep up the good work and redesign!!