@Alex_Uta
The Heatsink fell apart in the Oven, i wanted to preheat the whole assembly.
When i Heat the Shim with Low Temp solder (138C) it is melting really fast, but as soon as it touches the Vaporchamber its solidifying, as the Vaporchamber and Heatpipes dissipate the Heat.
Thats why i wanted to preheat the assembly but my oven whas to uneven.
I do not have a good controlled temperoven, where i would set the Temp to 140C and i have no heat resistant Clamps to hold the OG Parts together. Loose Loose on my experiments 
Edit: i regeated the already soldered assembly and pressed on the shim every now and then until i saw solder beeing pressed out under there.
Now it looks alot more uniform. Tomorrow i will try the assembly installed on my Mainboard.
