First I want to address the pen confusion. The D-rings on your helmet buckle together. This leaves a loop where the D-rings will be sewn. This loop must be large enough to allow the open end of the quick connector to be inserted into the sewn loop of the D-rings. Mine was too small so I cut off one of the D-rings and I had enough room for my claw to fit in the loop sewn on. I used a grinder at work but you can use a dremel or even bolt cutters to cut the ring off. I left a D ring so I can attach my helmet to the bike through the D ring I left. Now about the button. The same situation. You cannot thread an existing strap through the other end of the quick release buckle without removing the button. It was easy, I just popped (squeezed) the channel lock button until it fell apart. Super fast connection! I bought another one for my other helmet.
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