The infamous gear shifter return spring
Northern DIY Door Handle Spring Repair Kit (Six 2.5-Turn, 2.5mm Thick Coils Plus Six circlips)
Pistol Parts for Iver Johnson Arms for sale
No return spring in SRAM Rival 1 brake lever? - Bicycles Stack Exchange
TAG, return spring on lever
19247 - Caliper Lever Return Spring - R
Simplex 5448200010 Lever Return Spring, Simplex, Eplex, PK10
Maintaining Your Glock
Sargent 97-0425, Exit Lever Trim Return Spring - Replacement spring for some 80 series exit devices - for Lever trim with escutcheon.
Sargent 97-0425 Exit Lever Trim Return Spring