First thing is to make sure the guitar if fully tuned. The tension of all the strings at their proper notes bends the neck ever so slightly.
After that - in a pinch, I would probably stick something very small and thin (like half a toothpick), under the saddle on the high e side. This would bring ALL the strings up on that side (and I have no idea what it would do to the tone). I would never reccomed this for normal use.
Hell - Im not sure I should reccomend this for a single recording session either.
good luck,
Todd