Mini review of 2 clamps:
Kant Twist, about $40 from Start Haus.
View attachment 154303
Pros:
holds stone firmly against the guide, rubber pad prevents rotation of the stone. Solidy built little gizmo.
Cons:
PRICE. A bit tricky to learn to use initially. Needs to be adjusted a tad if some of your stones are thicker (Arkansas) than others (ceramic).
IRWIN Tools QUICK-GRIP Handi-Clamp, 1 1/2-Inch (59100CD), $7
View attachment 154304
Pros:
PRICE. Clicks and releases rapidly without having to adjust for different thicknesses of stones.
Cons:
Since the little yellow tips are plastic, not rubber, the stone can rotate against the guide in use, necessitating repositioning. The angle isn't lost, but it can slide and leave you with no abrasive surface. Tried using it as a replacement for the red spring clamp I use with the base bevel guide and it interferes with the vise because of the shape of the jaws. Unsure of long term durability as it is plastic.
Conclusion:
Since I own both, I'm returning to my Kant Twist. Neither cost ME any money, so that doesn't come into it. The Kant Twist, with its rubber pad, holds the stone more firmly and it's metal, so its little rotating cube on the side you can't see above won't get chewed up. It's also smaller so it's less prone to bumping into ski parts, vise parts, and stray electrical cords while in use.
However, if you're budget conscious, the Irwin will do the job. I just wouldn't Tarzan squeeze it as you tighten it, it's plastic. The Irwin is also on Amazon so easier to find. The Kant Twist is not currently on the Start Haus site and I can't find the exact one anywhere else either. I see them without the rubber pad (which is important) and with TWO rubber pads (possible use issue I think), but not a single rubber pad.
Either is better than the thumbscrew I got initially, which allowed the stone to tilt relative to the guide. Only the far/lower edge held it down, the rest of it only held if the stone used was the exact thickness you see there. Other thicknesses would result in tilting, nullifying the whole point of a guide:
View attachment 154307
More angles on the Kant Twist, if you're trying to find it online:
View attachment 154308