A had a chance to work on the jig today. This pic shows the rail/mount support piece using the keyhole mount. It is a piece of plywood the same thickness as the stock being cut. It is easily removed and replaced by another thickness piece as needed. The screws snug the jig up to the rail. I like the nylon screws because they discourage over-tightening and don't mark up the rail. Finger-tight is all that is needed.
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This shows the underside. The slider adjusts for different rip widths while the support piece remains stationary. By placing the screws offset along the length, the support piece can be end-for-ended and allow support for narrower/wider cuts.
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This shows the jig back in the wide-cut mode. The slider/adapter is removed and a longer rule installed. To change from one mode to another takes less than a minute.
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I still have more work to do but thought I would post an update.
John