Sorry for not responding sooner (out of town). By far the easiest way to install the stopper is to let the brake pedal do the work for you.
1) Depress the brake pedal as far as it will go to the floor. (If you're a gal you might want to have a friend do this while you're installing the stopper - it takes a bit of upper body strength to do both things at the same time). This will clear a space for you to position the stopper in place.
2) With the stopper in place SLOWLY release the brake pedal onto it, letting the force of the pedal push the stopper through the hole.
The hardest part for me was the weird contortions I had to go through in order to reach the area; there's not a whole lot of room down there!
Hope this helps, Mac
Wednesday, June 16th, 2010 AT 11:44 PM