Selling a few of the Red 19mm top mounts that also incorporate a Nato rail for a handle into the top.

They all work great. Some don't have mounting screws, but can he had for a couple dollars at most hardware stores. 

These were around $500 when they were first released with the DSMC bodies, but can also work with anything that takes 1/4"-20 bolts and uses a Nato rail. I've seen people use these on SmallHD 1303 monitors to hold accessories via Nato rail.