Return cover broken

[peacefulkancer]

I have two wall drains that suck in water for my waterfall. On one of the covers the screw rusted off (I swear the previous owner rigged everything around here so I wouldn't doubt if they used a normal wood screw). So on the pool side the ring that the cover attaches to has a rusted screw in it (tried to break it off, can't).

So my question is, does anyone have any fancy ways of getting that cover back on without draining the pool?

I guess one screw could hold it, but I'd rather have two screws on it. I can't exactly drill it out since it is underwater.

 

[peacefulkancer]

UPDATE: I got lucky and was able to get some vice grips on there and get the old screw out.