Ok, the question might be dumb, but I can't for the life of me figure out how to fit the acryl tube into any of the fittings on the bottomside of this top. This it the top: https://shop.aquacomputer.de/product_inf…roducts_id=3943 The tube seems to go in a few millimeters, but does not properly attach, meaning i's not secure at all, and a slight movement will dislodge it. I've used inhumane amounts of strength to push it into the fitting, but it just won't go in far enough. Am I missing something...