I have used the Kreg Automaxx clamps for three years. I tried a clamp by Milescraft or Anchor (I do not recall which), but it does not automatically adjust for thickness. The Kreg clamps are a little fussy to use, but get the job done.
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I had a friend make up some aluminum T-nuts to use with them. Before that I use a wooden T-nut with a threaded insert.
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I have Mac¡¯s clamps on order. They are not cheap, but have a loyal following. How much can you get for a kidney?
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John Hinman
Boise ID USA
Kappa 450X and A941