Featherweight

Transmutation
Level: Brd 1, Clr 1, Drd 1, Pal 1, Rgr 1, Wiz/Sor 1
Components: V, S, F
Casting time: 1 standard action
Range: Touch
Target: Up to 10 cu ft/level, see text
Duration: 1 hour/level
Saving Throw: No

After touching the object, its weight becomes insignificant, effectively 1/10 weight, for the spell's duration. Unattended objects receive no save while attended objects are allowed a save. Featherweight only works on inanimate objects. A complete golem is not a valid target, though a motor is.

Source: ?