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Criteria for patenting an item whose main part uses the design of a patent's part but whose function is diffrent

I visualize a way to modify - but principally leave intact - (only) one component of an existing patented, mult-component, commercial, marketed product whose conceived, intended, advertized, and ...
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Modification and improvement of a patented product by the user of the product

Can a user of a patented product make changes to the product for their own use (not reselling product) in their business ? From drilling holes to lighten weight or making their own parts for the ...