Has this ever happened to anyone? It's supposed to be a little bit further up and that black strap should hold it in place. Somehow it got moved down there and I can't get it back up since that black strap has the same thickness as the donkey dick... Any other Cabrinha owner? Should appel to brutal force?!

Yep brutal force will get it back up as brutal force got it down.
A little electrical insulation tape on the dege of the stopper will help it slide though.
Nico

just cut it off, good to go!