I've gone through every fricken idea and rendition on mine, and learned a few things in the process along the way. I might be able to help you out on it. I've also got a few good bookmarked forum pages that have a TON of info if you're interested. However I never went the mechanical limiter/lockout route with mine.

Are you changing cams to a set that requires it? If not there's other options that will retain your performance and gas mileage better with the stock cams and phasers. About 75% of "cam phaser" problems (the sound like it's some strange diesel hybrid) aren't actually the phasers causing the problems yet most dealerships will automatically jump to phasers.