That bit is suppose to look like this..
The hi hat stand should be 19mm. It looks to me like they have shoved one of the cymbal stands in there... They are 25mm.
A subtle difference but enough to ruin your hi hat holder clamp.
If that is the only hi hat arm you have, then don't but another like the one in the photo.
Instead just get one of these...
Or better still go back to the 'music store in Guadalajara' and show them this message.. (and have them get the correct clamp and supply the correct 19mm hi hat arm) .
(now I'm off to Google Maps to see where Guardalajara is.)