This is a brief How-To for anyone interested. I had grand ideas of a more formal effort but, I realized if I waited until I had time for that, it wouldn't happen. I have owned the original Mortise Pal and now have the current version. Both are solid well made devices that do just what they are supposed to. The current version does 3" wide material max, the previous model does 2" wide material max. The jig adds 5/8" to your cutting depth. To make this easy to measure around I drill a hole that is the size of the template collar in a 5/8" thick piece of stock. Now I can make actual measurements instead of mentally adding 5/8" to everything.
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Lets say I want to attach these two pieces and I want a flush joint.
I mark the center of the mortise position and use a bold line to indicate the "face" of the part. I will ALWAYS place the fixed jaw of the Mortise Pal against the "face".
Clamp the jig to your stock in such a way that you can see your centerline and adjust the template along the sliding rails until it is lined up. Lock it down.
Cont'd . . . .