I have installed the rear quarter windows, but find that they won't pull shut with the latch (or at least it is waaaay too difficult and I don't want to force things further without consulting the experts here. I am using the white/clear plastic 'desk pads' between the latches where they mount to the C pillar...but wondering if they are not always used and act as spacers when needed. Also, is it best to latch the window closed and then tighten the four secure allen head bolts at the B pillar? Thank you all!