Jonny, are you sure that the plug has to be pulled? Most of the skimmers I've dealt with have 2 ports and a lot of builders don't use the second port for anything, so glue the plug into the second port so thet you'll never open it. If you can get the Gizzmo, or plug out of 1 of the ports, leave the other plug alone! - unless you're MD is plumbed through the skimmer (even so, at some point the MD line may have failed ( ) and they abandoned it.

I used to have a tool for them that was a peice of square 'stock' fence pipe, the inside of the 2' peice of post fit nicely on a 1 1/2" plug - it wasn't mine, so I left it behind with the company when I moved.