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AUS729 said.. How do you secure the Gopro housing with a safety line? I do not seem to have a part that fits to the housing ?!?!

Those ones with a rope around the screw knobby end in that link don't look real flash.
Kite line or good synthetic twine thru the back door hinge pin are reputedly best.
Trouble is a really hard pull and that hinge pin pops out (its how u remove the back door) so essentially you are not tethering the camera with either this way or the one in the link above.
But at least with this the rope can't just slip off.