Okay, so I had added an undertail and had a small crack in the rear plastic (the piece that wraps the back seat) How on earth do you stretch this plastic on without stressing that vital area in the plastic (where it cracks on every CBR) ??? The crack is located right behind the front seat....I have fixed the crack and patched behind it and want to put it on right this time! Thanks

 

What kind of CBR are you referring to?