Been attempting to put my new aftermarket replacement window in for a few evenings now, best my wife and I can get is the zip about 3/4 of the way round then either some of the teeth come apart again or the zip gets stucked and one time it ripped oem stitching, I’ve used a silicone lubricant on the metal zip, watched as many YouTube videos as I could find too and they all seem to make it look incredibly easy, the zip seems to smoothly do up which is the complete opposite of my experience, one thing we’re not certain about is, attached to the hood is the original zip track and there are two separate ends, one goes to the left and one goes to the right, presumably in one big loop but I was wondering if it made any difference which way round you go? Only one end seems to clear enough to attach the new zip onto it