[QUOTE=technosnob;1565225]You could also try these...
http://www.workauthority.ca/products...tail.php?id=87
They have the same mechanism and wire bend as the ARC kits, just a different mount for construction helmets.
I have seen people with these mounts modded on Ops-Core helmets (youtube).
Check this
Ops-Core FAST Carbon Helmet - YouTube
I am using the Peltor 3M mechanism from a hardhat setup but had to make an adapter to be able to fasten the Sordins to it. (our team run with Sordins) Then I made the bracket that slides and locks into the rail.But am still looking for better ideas or designs.
In the Youtube there,at 4:31 looks like you can see the bolt that attaches the mechanism in a static position.
Thanks for the info @ technosnob