Help with Tonneau Cover

[steve04cobra]

Hey guys,
I was just wondering if any of you that have tonneau covers on your cars if you did any kind of personal modifications to ensure the covers don't fly off...I recently installed my tonneau and although it hasn't flown off it does move up and down when the wind gets under it...Wondering what you guys are doing to prevent it? any suggestions? Thanks in advance

 

[SpectorV]

ive never really seen mine move~ but many have issues with them fitting. Someone had a post where they had someone install some tabs/snaps one on each side and snapped it down, the snaps were on the area behind the back seat edge~ seemed to work good.