In my opinion it's a lot easier to just modify the CAD and push the fork over perminatly. I've done it on all my vehicals and it works very well. Only thing your gaining with the above link is the ability to unlock it when in 2wd so the front DS dosn't spin. I havn't noticed a decrease in gas milage at all having it spin all the time.

Personally (and this is just my opinion) I'd rather have it locked 100% of the time and not have to worry about it on the trail not engaging.