Buckeye,
I've always been a fan of the Zero Effect and used them for a few years but bailed with the pain in the butt tuning and jerry rigging to get it to JUST work with the parallel limb, short slide travel bows I've been using.

What makes this one any different than the other "regular" version?

I see the overdraw has been removed (which I did anyway) but what allows it to have the necessary leverage to work properly? From outward appearances it looks the same?

Does it get the launcher up to the rest mounting hole height and then down below shelf level?

I'd like to use one again on at least one of my bows but want to understand it a little better.