Hayward Skimmer To Main Drain Diverter Valve - Unable to tighten

[Bafrye]

Hello - when I went to open my pool this year, I was unable to tighten the screws that hold down the skimmer to main drain diverter valve - I assume it’s stripped where it fastens. Any suggestions?

 

[Bafrye]

Photo of skimmer - ignore red square, photo was used in a previous post