Flipper Fidelity. Works great for rattles.

Just tape the edges with clear shipping tape. It works fine..

The stuff Pinball Pro sells is a vinyl tape 1/4" wide but *much* thicker than shipping tape and a lot more durable too. I've had it on numerous playfields for years and never had it tear or have to be replaced.

It stops all glass rattle too. 100%

http://flipperfidelity.com/products.php?cat=Anti%20Rattle%20Tape&itemId=135

I saw this thread title and came in to suggest PinballPro.

http://pinballpro.net/shop/anti-rattle-tape-ar-1/

The prices are different between FF and PinballPro, but pay close attention to the length of tape you get. 18 yards from PP and 9.5 from FF

I tried to cheap out and use shipping tape, and it was hit and miss. Since FF started including the tape with kits, I have learned to love it. I'm buying more of the real stuff to redo my older installs. Also, my AFM has bigger gaps and even though it has the FF tape on one side of the glass, it really needs it on both sides to kill the rattle.

Cut out the middleman. Go order some of this:

http://www.shop3m.com/3m-uhmw-film-tape-5423-transparent-1-2-in-x-18-yd-11-7-mil.html

All you have to do is use this tape to line the lower edge of the channel the glass slides in. Depending on your situation you don't necessarily need to run the entire length of the side channel either. For example, on IM it worked just great for me to just put about six inches of the stuff in all four corners. YMMV.

My wife had some 8x11 sheet of felt that I cut into a thin strip and placed stuck it in the glass channel. Worked great and can be picked up at craft stores.

Seems quite a bit more expensive. Am I doing my math wrong?

Flipper Fidelity has a great product. I talked with Michael @ FF about the $17 shipping charge and he said they are working on getting a new site that will charge the correct amount for shipping based on weight.