I recommend you have a tube of clear silicone sealer handy and put a thin bead of it on the windscreen flanges (all around). Won't be visible when you reassemble and will ward off any vibration/buzziness.
Mine sang like a bird until I went back in and did this. I think the ZG is just a micron or so too thin to fit snug enough without the sealant.
It'll save you having to go back in a second time, which is a good thing. Not hard to do, but the tabs can break off and I hate breaking things. The less on/off, the better.