I have a Bell Lumen helmet and this adapter put the mirror much to close to my eyes than just having it attach to glasses. Also w this adapter you have to attach the mirror from bottom up which makes the overall position of the mirror different than attaching it on my glasses from the top. I much prefer the view when it's attached from the top. I tossed it after failing to find a good work around. Good thing it only cost a few bucks. I'd just use the mirror on the glasses and pass on this.
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