I use a single strand of small gauge electrical primary wire stranding to open those tiny holes. Nice thing is, you can use the single strand still in the insulation after stripping the insulation off the end of the wire, then selecting the one strand to use, and after use, put the strands back together and still use the wire for electrical stuff.
When I bleed a brake system, I do the normal pressure to the wheel cylinder to basic fill the entire system, then let the system sit for a time, allowing any air left in the system to rise within it. Then, I finish bleed through that tiny port all the remaining air. I hand hold the master with the lever end higher than the outlet, then gently pump the lever. Air will come out that hole if there is any left in the system. My 1986 Safari van has a factory 5 speed in it, and hydraulic actuated clutch. The master has cold weather issues, and I bleed it the same way, remove from firewall, tilt pedal end higher than output end, gently push piston, air evacuates through the pressure release port, back to 'works as new' again.
Jim is right on target, pressure release port. Wrong lever config, does exactly as he outlined, slip, slide, WHOA, whammo, crash, bang......ouch.
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edit....Wot Jim said!