First of all, I need to give credit to Nisbo for his awesome write-up of how to do this.. Great post Nisbo, and thanks so much for taking the time for the write-up and pics..
First of all, here is Nisbo's post- to use as a base-line:
Double Cab folding seats Mod
Now, here is my "even easier" version:
DEFINITELY take out the back seat. I left the seat in the back of my truck and I ended up with metal shavings all over the interior (they WILL spread)... TAKE THE BACK SEAT OUT OF THE TRUCK.
I did NOT have to use the 6 point star bit to remove the "hooked brackets" from the seats. I found it easier to keep them attached to the seat (to hold them in place). I used a jig saw with a metal cutting blade to just cut them while they were attached to the seat.
I used the hose from my household vac to vacuum up the metal shavings from the back of the seat (and the rest of my truck- since I left the back seat in the truck..)
Be sure to switch up the cut from Nisbo's cut... I made my cut in the same angle as the bracket already had, and it is working fine for me. NO slack in the seatbacks.
In case you are confused with the "2.5cm inside cut" that is mentioned in the original post (like I was), just measure 2.5cm from the outside of the bracket, and make your cut at the same angle as the original angle was at. That's what I did, and it worked perfectly for me..
Was it worth it? YES!! I was able to put a ton of stuff under my seat while "moving into" my new Tundra (even with my JBL sub box), but I was also able to put a few "extra's" behind the rear seat back- like a blanket, a pillow, 2 large towels, 2 inflatable floating "lounge chairs" and a pump!
Do it, and enjoy your extra space.. This is a COOL mod..