No 4 Mk2 disassembly, what is the trick?

[Seaspriter]

All it takes is a bit of flat steel with a notch ground in the end.

There are lots of ways to grind a screwdriver for the devilish slotted blade. Over the years (after messing up trying to use files, grinding wheels, and brute aggravation) my preference is to use several stacked cutting wafers in my Dremel tool mounted horizontally in a mini-drill press, and the sacrificial driver blade mounted in a adjustable position carrier vise.

While you are at it, if your front sight is the screw version, make a slotted driver for it too. Take an old screw driver with ~.25" diameter shank. Cut off the blade, leaving ~2.5" length of shank. Cut a slot ~.07" wide & ~.06" deep to fit the front sight adjustment screw. (apparently some MK2s don't have the screw adjustment, so if yours doesn't, relax, sip an English cup of tea, and enjoy a free moment to contemplate another project.)

I'm sure others have better methods and specs (so chime in), but this will get you started.
Anyone have a good method and specs for making the Striker Pin extraction tool?