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love the jig but just wondered with threads just below do you get any cupping or am i worrying about nothing.
That's usually the reason for alternating sides with clamps. It's to give even clamping pressure on the joint & to help reduce the tendency to cupping. You don't want the center of your clamping force applied to one side of the material. I think it would be more of a problem with material that's a little wider than shown in the photo.

Maybe a clamp could be added to this jig in the other direction over the joint to hold the joint down in the jig?
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