For those of you with a Mortise Pal or similar jig. I was bemoaning the lack of a template for 1/4" by 1" mortise. It took me awhile to wonder why I didn't just make one!?!
Cut some blanks of the right size. This hardboard happened to be packing material in a recent shipment I received.
Using your original to setup your stops, drill the appropriate size holes, counterbores, whatever. With an original to act as a setup guide, this goes pretty quick.
And there you go. The slot is created by using a forstner bit, again using the original template as a setup guide. To create the oval, I connected the holes with a chisel just as you might when using a forstner bit to drill a mortise. You can see how this one falls between a couple of the templates supplied, way back when, during the original MP's introduction.
I gave it a quick test to be sure the alignment was OK. Excuse the rough edges, these were a couple of cut-offs from some prior parts. This will come in handy for the door frames where I wanted 1" tenons that are coming up on my current project.