Loose intake grate

[Echorama]

Hi everyone! I have a 2012 challenger 210 se with twin 155's. it has the weedless system. I notice the port side intake grate is slightly loose. It remains in the closed position but has some play. I tried tightening it with an Allen key but none of the points seem to work. If I grab where the extending arm attaches onto the grate that seems to be where the play is...and therefore there is some play where the end of the grate tynes seat up against the boat hull. They stay where they should but jiggle a little and I would like to tighten...anyone help me where/how to do this? Thanks.