Remixed from 'tiking' original design to not require a separate extension arm.
This fits the newer style (2015+) chin vent on the GMAX GM11D helmet. And just in case someone is curious, the new 2015+ style chin vents will fit the pre-2015 GM11D. The vent holes are shaped differently, but the overall shape is the same to fit the helmet. Uses the same screw mounting point too.
Here's how video looks when using this mount.