Hi, This is my first post here and already have a question. Sorry for that. 40 years ago I bought my first watch and a day later, I opened the case back of the watch. My father caught me doing it. So that has been the story of my life since. I am not shy to check inside the watches and a while ago I paid my watchmaker to give me some private sessions on repairing Chronomatic movements. I just got my first NOS Heuer Monaco Case, which had the usual molten gasket disorder. So the case was glued together like a tank. Now I don't remember how many watches I have bought in my life but a NEW MONACO was like a dream for me. But the molten gasket made it a little hard begin. I filled the case with acetone from the crown-stem-hole and the rubber began to puff out of the case and damaged the NOS crystal. I could have broken the crystal and clean the mess with acetone but trying to save the NOS crystal didn't work. Now I have a question on the case construction. I have never seen anything like this. Two pieces pushed on each other and there are 4 hooks. Two of them are on the top around 10 and 2 and two on bottom around 4 and 8. I see Monaco owners disassemble the watches and take photos of the pieces but what is the trick in pulling the top and bottom part of the case without scratching or damaging the case? Luckily there was no movement and dial in my case, so I used force but even my watchmaker friend was wondering how? I appreciate any help.