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For an eyeshadow compact that actually uses a separate hinge pin, a loose-feeling lid and a stiff opening are different observations. Check pin position, lid movement and resistance during rotation separately. A photograph of a closed compact cannot reveal how its pin is retained, and this approach does not apply unchanged to a living hinge.

Observe the pin against a fixed reference

Identify the visible pin ends and the designed retention arrangement from the component information. Record their positions relative to the hinge housing before and after the agreed handling or opening sequence. A pin that migrates along its axis needs investigation, but movement alone does not identify the cause. Pin dimensions, bore geometry, retention features and assembly condition may all need checking. Do not dismantle the only sample before recording its assembled behavior.

Describe the direction of lid movement

Support the base consistently and define the lid angle and applied load when checking movement. Distinguish motion along the hinge axis from tilting or movement across that axis. Clearance between adjacent hinge sections, fit around the pin and housing flexibility can contribute differently. A stationary pin does not prove that every other hinge feature is correct, and visible play is not automatically a failure without an agreed functional requirement.

Measure opening behavior separately

First distinguish releasing the closure from rotating the already released lid. Check for local sticking, rubbing or changing resistance through the opening range. If reporting force, keep the load point and direction defined: force applied near the pivot cannot be compared directly with force at the lid edge. A torque measurement likewise needs a defined fixture and method. Record lid angle and any contact with other parts.

Sample display room. This background view does not establish a component structure, test result or customer endorsement.

Compare evidence before changing the fit

A compact can have both excessive movement and high opening resistance. Tightening one clearance may reduce play while increasing friction or assembly difficulty. Compare actual part dimensions, assembly observations and movement measurements before selecting a correction. Repeat the same checks after any design or assembly change; use agreed acceptance criteria rather than a universal allowance for every compact.

Sambound packaging context

SamBound New Material Technology Company Ltd. supplies empty eyeshadow packaging. Product information at sambound.com can help identify the selected case, but it is not proof of a particular hinge construction or test result. Confirm the actual sample and component revision before applying a pin-hinge diagnosis.

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SamBound New Material Technology Company Ltd.

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