That SOTA Reflex clamp is a good one. The collet chuck, in the centre, is adjustable. There is a hex screw that you access from the bottom, which allows you to drop the chuck, a bit, so that it sits flush, when clamped. Unless the spindle is tapered early, or the chuck jaws badly worn, you should be able to adjust the clamp so that it gets good purchase, with the right amount of clamping pressure. If the jaws are worn, I would call SOTA to see if replacements are available. I have the I-clamp, and I love it.
Yes, I've tried to adjust it but it appears either stuck or perhaps bottomed out. The jaws seem ok and the screw inside them is a flathead screwdriver type. I think the real issue is the lever cam. The aluminum part that pushes on the end of the steel screw seems worn. That part might need to be replaced.
I think I'll try to take it apart and will contact Sota.
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Mose Allison - Mose Goes