3D Printable T-Bar Nut Driver made in OpenScad. You generally need two sizes: Hex 11mm for pots and Hex 8mm for jacks. Plastic is good as you don't scratch your precious faceplate!
Recomended material: Nylon
Size of the target nut in mm.
Measured from flat to flat.
How many sides does the target nut have?
How wide do you want the handle?
The height of the socket.
The thickness of the wall. A thicker wall creates a stronger tool but you might want to check how much space you have. How thin you can make this depends on the quality of your print and material.
To make sure the tool slides nicely over the nut it helps to add quarter of a mil or so to the socket diameter.
Do What the Fuck You Want To Public License (WTFPL)