Unfortunately, birdboy, you probably need to sacrifice the window feeder and move to a squirrel-proof pole feeder further out in your yard.
Once those little buggers figure out how to get to the window, you're unlikely to ever outwit them for very long. And they will eventually start damaging your house, whether it's clawing up the siding or climbing on the screens or indulging in some other behavior.
I initially had my feeders hanging from the gutters so that they were directly in front of my window, giving me a great view. It took the bushy-tailed rodents a year to figure out how to get to them, but figure it out they did, and once they had done so, there was no stopping them. After another year of trying, I gave up and moved the feeders away from the house.
