Using the out-front bike mount from my 510 and it doesn't seem long enough. The bottom of Explore hits the stem and won't allow the quarter-turn necessary to lock it in. Is there a longer version? The quarter-turn mount that came in the box won't work on the stem. It won't get the Explore high enough to clear stem ends. I have to use the quarter-turn off to the side on the handlebar. I'd like to have it centered. Solutions?