Trouble placing an overlay on a counter

I am attempting to place an overlay onto a counter. I am doing an extention for Submarine. What I would like to do is place a Torpedo Direction overlay on to the Sub, so the player so no matter which way the Sub Counter is facing the overlay (Or counter piece) will be facing the correct way.
I noticed in the .mod of Flying Colors, the fellow was able to have the broadside dirctional arc follow the ship as it pivots etc. Something like that would be what I would like to see.
Thanks in adance

You’d want to use the Layer trait for that, but unfortunately, you can’t use an extension to add traits to a piece in the base module. However, you could Copy a piece from the base module, paste it into the palette, and then add the Layer trait to your copied piece.