TWDle owners, as you may or may not know, the left ramp damages the playfield, not sure about Pro.
To prevent this, use some 1/4 inch d profile weather proofing strip. Place underneath the playfield at the end of the clear portion of the ramp right before the metal section of the he ramp. This will not allow the ramp to completely close when down, but game play is not effected. Actually I feel it improves game play by minimizes the amount of times the ball goes airborn when trying a left ramp shot.