Hey there,
You can have a look through this ADF Does Not Feed/Pick Up Paper doc and it may help. You can also try rubbing an eraser across the cork piece. It essentially roughens it up enough to have a similar effect to the water :)
If all else fails you can also attempt resetting the printer with a partial reset (just make sure to follow the instructions for the A909a as that's the reset that will be helpful to you). Just beware that this will erase fax settings and possibly wireless settings, so just make sure to have that info handy if the need for it should arise.
Cheers!!