Any recommendations for a relatively lightweight and inexpensive camera clamp for wide railings, such as those found in football stands? The ubiquitous SuperClamp definitely works, but I'm already using two of those for my split omnis when I'm recording marching bands. While I could easily add a third for my camera in the middle (really just my phone with a tripod adapter), another one of those seems like overkill to just support a cell phone. Thoughts?