for those with helmets with slide / click vertical retention that simply slips, like my new helmet did straight out of the box
i slid 3 3x16in id o-rings that fit tightly (no glue!) over the end of the vertical retention adjuster, pushed 'em right down & now it won't slip down▼at all, used like a max limit but undo-able
adding them also pushed the bar out slightly (albeit a bit of a side effect!) so the teeth engage properly & also stops unwanted slip up▲, tho you can move it when you intend to
i didn't fancy cutting the very end stop off the vertical retainer so that i could slide it all the way to put o-rings on the bottom side too, i'll see if i have to change my mind
original italian design fixed by english engineering (haha)
try it @ your own risk !!!
