Inlarge connection Points

I need some help on my X-carve machine when doing 3D puzzles. When I download a project to do and change the size of the material thickness the connection points are to small to interlock with each other. I would like to see if anyone out there might give me some instructions on how to change just the connection points and not the whole item I am carving.

There is a method of creating a rectangle the size of the slot you need. Lay it over where the slot needs to be set it to zero depth and then combine with part.
Something like that.ake a copy and play with it.