Captain Stubling rig: how to zoom?

Hello:

New user here. I just bought a Captain Stubling-style rig for my Canon 550D, along with a follow focus, and last weekend I had the chance to test it in a "real world" situation for the first time. Overall I'm not unhappy with it... except for one thing that I should have thought of before buying it: how do I zoom in and out with it?

I use a Tamron 17-50 lens. I often do documentary-style work, and in those cases the zoom is often the quickest way to reframe a shot. The rig takes both hands, and using the left hand I can handle the follow focus... but there's no way I can reach the zoom, even if I mount the right-hand bar really close to the camera. I've read about mounting another follow-focus for the zoom, but from my tests, I'm not sure if there's enough space for that in my rig.

So... what do people do in these cases? Is there any other contraption I haven't heard of that can help?
 
I solved the problem by taking one of these lens gears i had aroung (http://www.ebay.com/itm/Flexible-Fo...415?pt=LH_DefaultDomain_0&hash=item3cbee4ad77 ) annd replacing the short little screw with one about 3 inches long. That way I position that lever near the hand I want to zoom with when I attach it to the zoom ring on my lens. Not a perfect solution no but a cheap one. The other option is to get a 2nd follow focus similar to this one http://www.hondogarage.com/index.php/product/landing/follow-focus and use that if it will work on your rig.
 
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