Is there a solution to mount LiPo batteries to a cage or accessory mount? Ideally, a metal piece that has rubber bands or something similar to hold the LiPo onto it and a 1/4-20 screw so it can fasten to a cage or camera? We're shooting with a C300 on Friday and I'd like to use something that isn't going to change the balance slightly every time I change the batteries. I realize I could use rubber bands or bongos to fasten the LiPos to the MoVI but something a little more professional looking would be ideal. Thanks!