Input please: halibut using a downrigger

I've been working on a go pro mount for my downrigger. Have a few prototypes but haven't been able to complete or test yet. I was hoping to get some good silver footage. I've seen the protroll but I want my camera to release of the mount on a strike so it captures footage of the fight as well as the strike. Proving to be a bit more difficult than I first thought.

Let me know if you want some help....I've got lots of spare time and I are a halfway decent engineer

I've been working on a go pro mount for my downrigger. Have a few prototypes but haven't been able to complete or test yet. I was hoping to get some good silver footage. I've seen the protroll but I want my camera to release of the mount on a strike so it captures footage of the fight as well as the strike. Proving to be a bit more difficult than I first thought.

Let me know if you want some help....I've got lots of spare time and I are a halfway decent engineer

Cool. Here's the prototype shell below. I planned on inserting the camera in back running the mainline through the mount. As the fish strikes, it'd pull the camera out of the shell and slide down the mainline to a stopper. I guess I could just fixt it to the line at that point. I was hoping water pressure and weight would keep it pointed in the right direction.

http://lh6.googleusercontent.com/-1H_jsDfQCDc/Ttw0gNPtSXI/AAAAAAAABsY/vbferkXlrNM/s1024-no/photo%20(63).JPG

Last year I tried the drag thing. It doesn't really work. I was using plastic bags filled with rocks. The bottom was tearing them apart. Then I switched to filling my drift sick with rocks. The bottom tore that up in short order too!  You need a lot  of weight to slow you down. Then I tried an anchor, that was scary and pretty dang hard to retrieve! Trolling just off the bottom is probably your best bet.