Many Gridfinity designs have large magnet holes that require glue. There are a few different 4 magnet jigs, but if you're like me, you put way too much glue in the hole, and now the magnet's pushing it all up into the jig, half the magnets are now glued to jig, and now you've got cyanoacrylate all over your fingers. This jig is a flat, smooth surface that seats the magnet into your Gridfinity part. If you did over-glue, it's far easier to wipe this flat surface on a paper towel.
Insert a magnet into the slot on top, then put a magnet on the flat bottom, and align it into place on your Gridfinity part. Pull the jig horizontally away from your part (DON'T lift up, make sure you slide it away), and your magnet will now be in place.
The jig's magnet hole is designed to pressure fit a standard Gridfinity 6x2 magnet. If you need a jig for pressure fitting, I suggest using my pressure fit jig.
The author marked this model as their own original creation.