I made this jig in order to circumvent purchasing a very expensive woodworking tool that is incredibly useful in creating mortises to accept loose tenons. This is mounted to my workbench to my benchdog holes that are 6 inches apart. This can be mounted to T-track as an alternative.

This is set up for using 8mm x 22mm loose tenons, but other templates can be used as long as they fit in the center slot.
https://www.amazon.com/gp/product/B0781FC87D/

I used this router bit:

https://www.amazon.com/gp/product/B0012K5YDK/

With these bushings:
https://www.amazon.com/gp/product/B07H935NT6/

In my router with a plunge base.

Additional parts needed:

-¼"-20 Thread size T-slot bolts

https://www.amazon.com/gp/product/B0765NZKW2/?th=1

-Hex head bolts

https://www.amazon.com/gp/product/B00L1L8A8Q/?th=1

-Threaded inserts
https://www.amazon.com/BOW-Products-XT2-T-Track-Clamps/dp/B0CJB16HBQ

-T-track clamps

https://www.amazon.com/gp/product/B0CJB16HBQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1