Yesterday's timing belt changed

Yesterday, we bought our fat guy a new timing belt. I have to say it was easier than we thought. Except for the sh... lower M10 screws of the right timing belt cover, which were obviously ginned by the previous owner or his workshop at the last change of timing belt, everything went smoothly. Although I have at least 30 pitten on my fingers But the pain is fading again.
Now we have a new windshield, new brake pads (the good ones from EBC), new brake hoses, new rims, new tires, new timing belts, Wapu, Thermosthat, distributors, distributor caps, new oil and frost protection and a new Lima controller. Puh was expensive again. The stupid one is I need the days a new cooler The thing is from inside!!! It's so lazy. Does anyone know the problem? The cooler looks quite new from the outside, but you only need to press slightly against the water channels between the slats, then the place will leak immediately. It's almost as if he was just made of aluminum foil?!?! What can that be, or how does that happen?
Greetings Stefan