HANS the cheap way
Discussion
tapkaJohnD said:
but of course Americans or even NASA haven't heard of metric!
didnt one of their probes miss its target by several thousand miles recently because nasa were using imperial and JPL were using metric..a mate of mine was over in the states building a new metric truck. everything was in multiples of 25.4mm for some reason

Birdthom said:
On a pre-drilled helmet, sure, but would you really drill your own fixing points?
I have always purchased helmets with pre-drilled holes, but a factory drill bit looks the same as my home drill bit. I would have no problems at all drilling a hole in my helmet. It's not NASA rocket science 
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