Darwin,
I have the same problem with my 100 - 300mm APO lens - it's so bad that I just quit using it. I was shooting baseball, from the bleachers, and stood up to go to the concession stand and the thing hit a lady in front of me right on top of her head. Embarrassed the hell out of me. Maybe I'll find a rubber band and give your fix a try. It's too good of a lens to never get used.
My college softball team won the region/state championship and will be playing in the nationals in Plant City, Fl in a couple of weeks, and I've been commissioned to ride with them and take pictures. Should be a lot of fun, but I doubt that I'll get the access that I have to the field here, so have to pack a bunch just to make sure that I have what I need when I get there.
John
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My equipment list can be found in my profile.
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Life should not be a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid broadside, thoroughly used up, totally worn out and loudly proclaiming, 'WOW! What a ride!!'