I often use hex head bolts or drill point screws and take a grinder to the heads and muck up the head, it takes maybe 3- 5 seconds a head to do the job, I then only do one per module, much like a locking lug on a wheel - you only need one to stay in place.
Bob-O's solution is a damn fine one but a bit expensive. If you want the fancy tamper resistant hardware I found the best prices at: http://www.tamperproof.com/tamperproof-screws.cfm They will sell direct and #10 x 2" SS sheet metal screws are $38/100.
All in all, I've been amazed at the overall lack of module rip-offs in the nearly 30 years I've been around them.
-jeff o


>From the Solar, Wind and Hydro powered office of Jeff Oldham



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