well getting that small of a allen key is goign to be a bit hard, I can dig out my calipers and tell you the exact size of it if you really want to buy a new one as most allen key sets at walmart and canadian tire won't ahve one that small. Or just fint a jewlers flat head screwdriver and *carefully* unscrew it. this is what I did when i first got my gun and as long as yoru carefull you won't strip it.
as far as the rocket valve.. not sure why it would be scratchy sounding or not going in smooth... it woudl probably be worth while to take out the pin that hold the valve and spring in place and clean the inside of that chamber really good. taking apart the slide mechanisim is really easy to do .. just make sure you look at a parts diagram while yoru taking it apart to fully relize how to put it back together again.
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