Found this nice, wide red button.

For my foldable shoulder rig ( http://marcuswolschon.blogspot.com/2011/11/shoulder-rig-modification.html )

I'll not only have the RC04 remote for the Zoom H4n sound recorder on my left handle ( http://marcuswolschon.blogspot.com/2011/11/new-zoom-rc04-holder-rc2.html )

but.... also a nice red button to start/stop the recording and a smaller green button to the side for focusing (shutter half press) on the right handle of the rig.

Since the 3d printer works again for small parts, I can finally print these and try them out on the rig.
I hope to actually try these next week when I'm away with friends.
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