I did this for min Sony FDR-X3000r but probably it work in other Sony Cam with similar form-factor.
To mount u need:

• one 1/4'' screw like these http://fave.co/2ouks0i or http://fave.co/2ouhfOr (10 mm long)
• one gopro or similar helmet adapter: i use this one and i think it'is the best http://fave.co/2ouhQ2D or http://fave.co/2ouzZgv

If u want the bubble level version u need these: http://fave.co/2nwZmty

U can choise the version u prefer:

• strong: normal strong;
• very strong: for enduro guys or stress use;
• very_strong_livella: for the bubble level-

Good luck !