Alchemy Audio - I've replaced the string / spring kit on these Ernie Ball VP Jr. volume pedals several dozen times and it's still an exercise in patience every time - even
Amazon.com: Ernie Ball Cord & Spring Kit, for Full-Size Volume Pedals (P06157) : Musical Instruments
Ernie Ball Volume Pedal Spring and String Replacement - iFixit Repair Guide
VPM-1 Volume Pedal Mod for Ernie Ball Volume Pedals - Zeppelin Design Labs