I finally received the 2 complete operating portholes I ordered for my H260. (It took forever to get them 5-6 weeks, definitely not 2-3).The others had simply disintegrated on me. I assume the outside frame assembly stays attached to the fuselage and I just re-insert and re-use the 4 screws and re-install. The old portholes came right out, so my question is shouldn't I be applying some type of silicone sealant around the edges for a more watertight fit?