Gorillapod Magnetic would be able to hold tight. The flexible little tripod's tips certainly give it a surprisingly strong pull -- a shame it only holds 11 ounces, else we'd be putting our DSLRs in some crazy and unreasonable spots. Want one now? You're in luck -- it's on sale over at Joby's website for a pile of change less than $25.
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Joby Gorillapod Magnetic flexible tripod hands-on