I was responding to the question asking how you can return to the same 0 when you can’t guarantee the piece is not the same as the previous when I mentioned the L bracket. I got the bracket from @gdon_2003 from this post.
It is really helpful for keeping a consistent x and y zero location in the lower left. I have threaded inserts in my waste board and traced the L bracket so I can remove it and place it back in place. I also insert a square into the corner when inserting and use the quick action to return to that location before locking it down and confirm that I have it lined up exactly. Saves me a ton of time for jobs I run a lot.