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Excellent Holdfast Clamps made from screws
I made a Holdfasts clamp using a screw and a square pipe.
Very easy to use and can be fixed firmly.
Parts list
・adjuster bolt
https://amzn.to/3cYKcNt
・plastic knob
https://amzn.to/3qqAmXL
・Square pipe
https://amzn.to/3BsNEJK
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