I've dismantled a padlock before, different type, but it still worked. The one I dismantled I had to use a heat gun to expand the casing and a heat sink to keep

I've dismantled a padlock before, different type, but it still worked. The one I dismantled I had to use a heat gun to expand the casing and a heat sink to keep the interior cool. You can actually assemble things inside a bottle using callipers and dividers, they generally have much better length on them than a pair of tweezers and are much easier to pick up than an adequate pair of forceps. I wouldn't doubt some of the narrow necked items could be assembled using forceps.