You can easily clean almost any knife with WD40, a Q-tip, a paper towel, and a toothpick. There is no need to take them apart.
Newer knives are assembled with screws because it is easier and cheaper to make them that way. The screws are not really there to take them apart.
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The screws are no there for the knife owner to take his knife apart. The screws are there so the knife manufactures can emply semi trained people instead of trained cutlers who know how to set rivets and krink blades. In the end, it's about the money and profit margin.