Posts: 40 Location: Britain/Germany
Wed 02 Mar, 2016 8:59 am
Dear Bernard,
I've done a good share of HMB (We call it "Heavy Metal Buhurt" though), so I know exactly how it works, and what requirements the equipment needs to fulfill.
First off, this kind of sport takes a huge toll on your equipment. Expect heavy denting and deformation within a good year of use. Keep that in mind, you might need a helmet every few years...
This is the one I use for HMB:
Keep in mind that the larger the holes, the weaker the material holding your visor together.
I wouldn't go larger than 8mm, the design shown on your last example image is already about perfect.
Reason is, as I said, HMB takes a heavy toll on your gear... so if the holes are too large, there is too little metal in between, and breakage from heavy hits is more likely.
When you get pollaxed in the mug, you really want that visor to hold.