The Picavet rig has a long history-- developed in the 19th century for kite aerial photography and rediscovered in the 1980's. It uses a continuous loop of string through four points on a platform and 2 or 4 points above to automatically level a platform. [See this great page on Kaper.us](http://www.kaper.us/basics/BASICS_picavet.html) for construction details. [Quality commercial kits are available from Brooks Leffler.](http://www.brooxes.com/newsite/BBKK/KITS.html) Several mappers have built simple variations of the Picavet: Chris Fastie built [a dual-camera Picavet rig](/notes/cfastie/2-22-2012/dual-camera-kap-rig) and has a great video showing its construction and first flight. Michele Tobais uses a [Picavet rig built on a trash can to provide extra protection for huge cameras](/wiki/trash-can-rig-heavy-cameras) Jessi Breen is [developing a mini-cd crate picavet to protect her camera](/notes/jbreen/3-6-2012/evolution-picavet) The [FABA collective has made a picavet](http://publiclaboratory.org/notes/juan/6-5-2012/fabaoutfit-vertical-kap-and-bap) similar to Michele's trash can rig but with a few ingenious uses of rubberbands and springs. Definitely worth integrating into your kit. Mathew Lippincott has a simple modification of [the PET bottle rig](/wiki/pet-bottle-rubber-band-rig) [to add a picavet rigging](http://publiclaboratory.org/notes/mathew/2-5-2012/picavet-pet-rig)