And of course, you know not to push the pedal all the way to the floor when the bleed screw is open. It's an easy way to kill a master cylinder. You don't want that piston travelling too far! Just go 3/4 of the way down and close the screw. Pump the pedal up a few times and have your helper open the bleed screw again and make sure it's closed before you hit the floor. By the way, master cylinders aren't expensive. And it might be good precaution to put one on--as well as grommets! And remember to use a good quality DOT 4 fluid, such as Ate SL type.

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Regards,
Aaron