So here is a wonderfully useful tool from Shachihata: the Artline 710 Long Nib Marker.
What’s the big deal, you ask? Not if you’re a handyman, you don’t!
This funky looking tool is designed to fill a very specific need: marking through deep holes, as when you have to drill holes in the wall to hang some bulky object. Without this tool, you must bend over backwards to find a way to do this, for instance by trying to scractch the wall with a nail inserted through the object, while trying to keep it level. With this marker, this frustrating challenge becomes a piece of cake.
Good idea, Shachihata!