In reply to trail_fairy:
Perhaps more useful, a list of bad things to look for: (some of these are a little over the top - I seriously feel like I'm describing my rack
Wires: Rusty wire (light surface discolouration ok), frayed wire, deep (0.5mm+) and/or sharp tears/nicks in the alloy, damaged cable crimp (light surface damage ok)
Hexes: Significant deformation or tearing
Slings (including on cams, hexes etc): Furriness (a little light furriness is normal and ok), nicks, staining/discolouration, stiff or poor handling sections.
Rope: Soft spots, hard lumps, split sheath, bad furry sections, scorched sheath, stains or discolouration, oval or flattened sections, general grubbiness (indicative of careless use). Try to id the type of rope, it may help you get a feel for the age.
Krabs: Bubbly flakey corrosion (obvious and visible with naked eye), seized or sticking gates, deep (0.5mm+) nicks in the gear end krab, small nicks in the rope bearing surface, gates that don't close (indicative of deformed body)
Cams: As for wires, loose nuts (very old cams only), bent stems (small but stubborn bends in wire stems are ok, bent alloy stems aren't), visibly bent axles (the bit the cams pivot on)
Harness: Fraying, furriness, discolouration or staining, poor handling, broken or missing stitching, general shabbiness
And if you do talk her into getting rid of the soft bits, at least offer it up on here rather than bin it, I bet it's in better nick than my rack!
jk