You can see an in-depth explanation here (including file downloads) but the short version is that it’s a wedge joint, working as shown in their example:
Sooner or later I’ll give it a go myself but thought I’d share with all of you first, because in my case “later” could very well be in March… 2026.
This is dope, thanks for sharing
Brilliant
This joint is called a “fox wedge” mortise & tenon joint. It adds incredible strength and is a fantastic way to salvage a loose mortise and tenon joint.
What makes it different though is that it has tiny tabs ok the wedge which makes that whole section one piece until you whack it with the hammer
I think it’s smart and simple, my only concern is pretty much any time I’ve put a hammer to thin plywood it cracks or breaks in some way
Also having the wedge as one piece makes it almost impossible to get glue in there