Did you loosen the two screws on the back plate before trying to turn the knobs? I would highly recommend not using any tools on the knobs -- I sure didn't need to.
Nate
It isn't hard to fashion a pick up out of copper fittings. I made one out of a 1/2" threaded to sweat adapter, 2 short lengths of 1/2" pipe and a 90 degree elbow. Solder it all together and screw into the fitting that you bought.
This does stick into the kettle by a few inches and does pick...
I've just had a beer from Otter Creek called Sphinx. The bottle says it is based on an Egyptian recipe.. Has honey & chamomile and some other stuff. I think they over did the honey a bit in this particular beer, but I do recall seeing a few things about ancient Egyptian brews, so maybe search...