Please take off both end tanks. Have some patience and time. This goes back to not rushing and doing things properly. I will assume you have now taken the flathead screwdriver and pushed up all the teeth on one side of the intercooler, so that you will be able to pull the end tank up without any interference from the teeth. Now carefully pull up on the end tank. You may have to pull more on one side for that side to un-stick. That's fine. Just don't be in a hurry. Part of the rubber gasket may still be sticking to the end tank in your hand, while the other part will still be sticking to the intercooler itself. That is to be expected. Just take your time and don't rush. After the rubber gasket is in your hands (that is, it is detached from the end tank and detached from the intercooler) I suggest you gently wash the rubber gasket with soap and water. Some may laugh at this. But this is what I did. There was a little bit of grime on the gasket, so I washed it. Dry it with a paper towel or a "clean" garage towel, and then set it aside (somewhere where you won't forget to put it on or step on it or rip it).
Here are a some photos of the process of lifting the teeth and pushing them back down.
When securing an end tank down with the metal teeth I suggest you use a pair of vicegrips. They will be able to push the teeth down to create a secure hold on the end tank. Adjust the vicegrip appropriately. What the hell does he mean by that? Well, I mean that you don't need to squeeze the teeth down so incredibly hard with the vicegrips that you damage something. I'm sure you can figure it out when you get to it. After doing this I am skeptical that one could seriously damage his SMIC. However, you need to use common sense.
Another thing about using common sense-
MAKE SURE YOU ONLY FLIP ONE END TANK!! You do not want to flip one end tank and then forget you already flipped one, and flip the other end tank. This would, of course, result in your SMIC being basically the same. Furthermore, you would have to go back and flip one of the two to make the install more successful. Plus, you would have just wasted more time and energy than necessary.