Just got a Mobius, and I'm experimenting with mounting. I had the notion of improvising a mount on the rear view mirror arm. I bought a small t-brace, and a matching mending brace, and a couple of small ceramic block magnets, and 8 small magnets with sticky foam on one side (I used 6 of them).
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So a couple of nuts and bolts would let me lock the t-brace onto the back of the mirror, and the "T" extends straight ahead toward the windshield. Then I stuck the ceramic magnets onto the t-brace, and they grip it firmly. That makes a magnet base. Attach the sticky foam magnets to the Mobius, and it should stay. The following view is looking up at the mirror from the dash behind the steering wheel:
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Here it is with the camera attached:
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...and this from the outside:
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I'm reasonably happy at this point. The magnetic grip is a bit weak, because those foam magnets are pretty weak. If I want a stronger grip, I could remove them and glue a stronger ceramic magnet to the Mobius.
Right now, the wire is dangling. I've got a right-angle mini-USB short extender on order, which should route the wire nicely toward the roof.
This listing on eBay was recommended in another thread.
Anyway, I'm fumbling with this, but I'm pleased that I could do this without tools and without doing anything irreversible.
By the way, I'd bought several of the mount options from BuyMobius, figuring that I couldn't really know what would work for me without trying. The standard mounts worked well enough, but they dangled the Mobius more obtrusively than I liked. This motivated me to keep trying.
Addendum: I may end up replacing the magnets with Velcro, which are lighter and have a lower profile. I started with magnets because they seemed more flexible for experiments.