Ce dont vous avez besoin
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AliExpress is a good source if you don't mind the long shipping time.
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Tighten the hex head screws evenly on both sides.
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With the hex head screws removed, hold the coupler with pliers when drilling. Drill the 3mm coupler end with a 3.1mm drill bit past the hex screw holes. Attach the wisk and tighten the hex head screws evenly on both sides.
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To reassemble your device, follow these instructions in reverse order.