Williams/Bally Compression Spring
Ships from US and is sold by Pinball Life$0.80
This spring is used in slingshot assemblies, saucer kickout assemblies and various other assemblies by many different pinball machine manufacturers.
Williams/Bally #10-128.
Data East/Sega/Stern #266-5000-00.
Jersey Jack Pinball reference #13-007004-00.