Hello, the pop top has two adjustments. On the handle that you pull down
on, there are two 10mm nuts. There slots behind these nuts.With the top
popped,loosen the nuts and move the slots for a tighter closing of the top.
Push the loosened handle towards the sky,then retighten,  for a tighter
closing. This ,however, will make the squeezing of the handle more
difficult to do,when closed.Also, the two hinges on the rear have slots to
move the large fiberglass top forward and backwards about 1 inch.This
adjustment is probably ok. When the top is closed, look to see how large
the gap is between the luggage rack and pop top.Sorry, I dont know the spec
on this .  Mine just looks right (Ha Ha).