The tensioner has that spring built in which only lets it go back about .8mm or something (which seems to slightly defeat the point I guess).
It has a small flat head screw head inside and outside just a textured head for finger turning. Might just break them off.

I would really rather not go through the hell of putting links back in with no masterlink. Took me forever with the tiny chain breaker on my multi tool.
I've seriously had it with living in the countryside.

And the pervy old teacher guy downstairs just sort of language barriered me into going drinking with him tomorrow night to one of his favourite hostess bars. No ride, Kindergarten in the morning with no music to play and a night of drunken electronic dictionary searching.

Urgh.