I have read that a few people do not trust the MCL brake cover with RAM ball mount for their GPS device. In looking around the forum, I saw a pic that appeared to be one of the U-bolt ball mounts attached to the bottom of the mirror stem. Just wondering if anyone knows the diameter of the stem? I found a U-bolt mount online that will accomodate sizes as small as 1/2" but am not near the bike right now to measure it for myself. TIA!!!!