The little tongue that catches the lip of the cap catches the lower edge
do this very progressively as you will warp them & they may not want to stay on when put back
The tongue will leave a small indentation sometimes but only on vinyl top cars & when trying to get too much at one time
always at least the beginning two starts get a little pulled spot
If it bothers you when put it back a rag & a body hammer will fix it
most of the time you won't notice it