Schaller Guitar Strap Lock Wrench

My strap-lock keeps coming loose and I never have a wrench handy to tighten it. So I designed this to keep in my guitar case.
This tool consists of two parts; the lever to hold the back side at the angle you want and the socket wrench to tighten the nut. The lever stores in the handle so they will always be together.
See the pictures of how to use it.
Designed for my Schaller Strap lock but my work with others 13mm or 1/2 nuts.

Please share a picture of any makes of this. Hope it comes in handy.