After reading up about fixing shutter holes on the internet I just fixed mine, fast and easy.
There were 2 holes in my shutter from someone pointing the camera at the sun, (prior to me) I had my wife go to Home Depot and buy me a can of "Brush-On Electrical Tape" in black
. (Make sure it is black!) It comes in small tubes but they didint have any so I have a large can (size of pvc pipe glue) of black goo. I took a small wooden match and dabbed a bit on the hole, smoothed it out as much as possible, repeat on the other side of the shutter, and let it dry 24hrs! The stuff dries rubbery (like the shutter curtain) and is guranteed not to dry out or crack. I will probably send my M3 to Youxin Ye when I get back to the states for a shutter replacement anyway, but for a quick and cheap fix this cant be beat.
I would recommend that you do not wind the camera or release the shutter for 24 hrs to insure that you do not get any wet goo inside your shutter.
*disclaimer* This worked great for me, but do not promise that you will not accidentally put your finger through your shutter if you are ham fisted or un-coordinated!