thank you very much! luxury pics for the explanation included

tried to unscrew that top pin, but it was very tight and i was afraid of scratching the reluctant top cap, so i preferred to ask. blind newbie, but prudent..

after one hour in the freeze and some pliers, it's ready to host the whole universe of atos. but the taifun will never lend its vela to any other, i'm afraid. they fell in love at the first sight. it's my best aesthetic combo now.
the switch is perfect. soft, smooth, silent, throw of about 1.5mm. tried magnets (10x6x2mm), but they don't fit this switch. it should be (<11) x (>7) x (<=2). for instance, 10 x 8 x 2, or 10 x 7.5 x 2 (i found those in the net). will try them when arrived and report. hope the switch keeps identical behavior with them, but corrects the slight wobbling. using 2mm thickness magnets, the throw will be lower than 1mm (if higher draw desired, try to find 1.5mm thickness in magnets).
i took another of my usual horrible improvised fast photos..
Edit: btw, removing the lower pin, it seems to hit harder (now i see you took measures to fit your batteries tight). big thanks!