Strengthened Bed Mount

Just a quick mod to the Bed Mount on the awesome cam mount system I am using (Thanks WardF!). For the rest of the files please reference the source files that this is remixed off here - https://www.thingiverse.com/thing:2100091

I had 2 of the bed mounts snap on me as the 2 parts were not held together by much. I pretty much just hollowed them out and now its strong as!