universal hook wrench for disinfection liquid canister (56mm)

This is an univeral version of this --> http://www.thingiverse.com/thing:1404705 , because Ecolab changed the canister lids very often :(

56mm diameter

There are two versions:
One has only the hook. The other version also has a small "support" to compensate the elevations, since it would otherwise bend too much.