The industry standard has always been to use staples to attach the louvers to the tilt bar. The problem with this is that the wood louvers and metal staples contract and expand at different rates so the staples eventually loosen and can fall out.
We designed Kestrel shutters so this would never be an issue. Instead of staples we use solid brass screw eyes to secure your operable louvers to the tilt bar. Holes are pre-drilled in to the wood and then the brass screw eyes are threaded in. This means your louvers will never fall out. Ever.
Another problem that we found common with operable louvered shutters was the need for a tensioning device to keep the louvers from sagging. These are usually adjustable screws that are stuck in the frame of the shutter. The tension screws need to be adjusted as they become worn and if there is drastic change in humidity.
We decided to go a different route entirely. We balance our louver blades so that they rely only on gravity, which we thought was a very good idea.