Quoted from MikeS:After watching the Robert Gagno video where he reached RTTH without a flipper rubber on the upper left mini flipper I thought I'd give the "no rubber" thing a try myself and the results are fantastic!
I can make 4-5 mini loops in a row pretty consistently which I could never do with the rubber. I can also make the "Super" shot more easily and shooting lower orbits is easier and more lucrative because you no longer need to raise that flipper when doing loops. The only downside I can see is that it could make that flipper more prone to breakage with it off. I think the ideal solution would be some kind of low profile rubber to use as a compromise but I'm not sure if something like that exists?
If you want to see the difference yourself, give it a try!
Is the video on youtube?