This unit is even simpler than the first - we just need to drill the adapters and connect them with a screw or bolt. Here I'm using a 6mm bolt because it's what I had to hand. You don't really need one as heavy as 6mm. This bolt is 60mm long, which provides room for 5 adapters with enough left to mount the unit. The larger drillbit in the picture was needed to ease the original holes out to 6mm.