Amazon.com: TRUE MODS Heavy-Duty Barrel Spring Mounting Base [Chrome-Plated] [6mm Spring] [1/2" Mounting Hardware] CB Radio Antenna/Lighted LED Whips up to 102" : Electronics
Coil Over Barrel Springs - Landrum
What Is a Barrel Spring? - IDC Spring
Compression Springs, Conical Springs, Barrel Springs and Cylindrical Springs