Actually, I think the thing that Jim left out is that these may be preferable to the store bought versions for a couple of reasons.
1) I've got a couple of store bought ones. I like to get the featherboard right up close to in front of the blade, but the store bought ones can't get into the right position because of the zero clearance insert on my saw.
2) The store bought ones work, but may not be as strong as the ones Jim made.
What I like about the idea of this is that you could offset the feather board enough from the ZCI so that it can work for cutting small strips.
Really a very nice idea Jim!
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