For those installing the Ninjacamp VUK protector, I have a simpler way to install the backstop piece. I basically followed their pdf except for a few spots...
This is abbreviated a bit assuming you've already read the official doc.
My simpler steps:
1. Remove the mech
2. Drop playfield and sit on two supports in front.
2. Insert the tpu backstop piece and rotate it counterclockwise it'll it stops.
3. Using 3" of scotch tape, fold over last 1/2" to make a "handle". Using the rest, temporarily tape the tpu backstop to the wire behind it (right side of inner loop). The goal is simply to keep it upright for a few minutes. Doesn't have to be perfect or pretty, just basically in the right neighborhood.
4. Lift playfield and insert duck bill as directed. Ensure you're fluffing the tpu on the top side from underneath to make sure the leading edge covers/ protects the wood properly.
5. Do step 2 again. Fluff tpu as needed carefully with edge of small screw driver or toothpick (safer). Remove scotch tape using handle.
6. Reinstall mech, test, etc.
This is a TON easier than removing the wire form etc. Works great!