The other topic was locked so I'll post this way. I have made the tool two different ways. One is to braze a square socket screw onto a steel rod.
The other is to get a piece of steel, (I used an old screw driver), and cut a slot in the end with a dremel tool to make a small open end wrench.
It is best to cut it at a slight diagonal so that by turning the tool over you have a different angle of grab. Cut the slot under sized and carefully file to fit with a jewelers file.
I also use a small (i/8th inch ) number stamp kit to stamp the cleaances inside the rocker cover so that it is always there when you work.
Ignition point pliers (really small set of channel locks) and a box wrench.
Use a square drive deck scew clamped in your needle nose vise grip pliers that should be in your bikes tool pack anyway.
Your tool design would be small and compact though.
Deck screw with the threads wrapped with duct tape or screwed into a short piece of wood dowel or shoved into a piece of fuel line. All handle options work.
anyone notice you can actually use your fingers to move the adjusters?
i usually don't have a problem of my adjusters moving with the lock nut. i always recheck the clearance after tightening the locknut... this reminds me that i need to do an adjustment, i'm having a little excess upperend noise.