Identify the function of the original fitting
A connector that aligns two panels has a different job from a structural bracket or anti-tip fixing. Any replacement must be suitable for the same function, not merely fit the same hole.
Repair versus replacement
A loose cam, stripped board or damaged hinge position may have several possible remedies depending on the material and remaining strength. Cosmetic repair and structural repair are not the same thing.
Custom brackets and alternative hardware
In some situations a suitable bracket, plate, spacer or other hardware solution can resolve a site-specific problem. It must be selected or fabricated around the load, material, clearances and intended use.
Wall fixings depend on the wall
Tall furniture and wall-mounted units require fixings appropriate to the actual substrate. Masonry, timber studs and different board systems do not use one universal anchor.