Discussion
Which precaution applies when refitting a tapered joint?
Answer: D
A taper locks by friction, so oil or grease on the surfaces prevents it from gripping and the joint works loose. Both surfaces are cleaned before assembly. Lubricating a taper is a common and dangerous error. Naming what changes and what stays the same is the reliable route through questions of this shape. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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