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The ScrewKeyDoo is the perfect tool for loosening and tightening the needle clamp screw on Bernina Sewing Machines. Compatible with models that use the small black screw like found on the Artista and Aurora models, but not with the new 700 and 800 series see part BE103. Please advise to use caution when tightening needle clamp screw. Overtightening can cause damage to the needle shaft. Made in the USA