I'll post a picture of how I have it cut later today, but it really helped even out the bottom (no wobbling) as well as providing a lot more grip than the stock rubber pads. They can still start to lose grip after getting dusty, but a quick wipe with a damp cloth gets them grippy again.
I currently have them mounted to my chair, so the pads are not necessary anymore, but you can still see how it is cut like an "L" around each stock rubber pad at the corners. http://i.imgur.com/5B4PadZ.jpg
Sorry to bump this thread after 4 months...
CODKill - where did you get those brackets for your chair? They look really good.
Cheers, Rob.
In answer to the original post, try some hairspray. Its sticky enough to hold, but can be removed.