Which manufacturing bottleneck most significantly limited the vinyl record industry's ability to meet surging demand between 2015-2020?

The resurgence of vinyl records represents one of music retail's most surprising comebacks. After nearly being made obsolete by CDs and digital streaming, vinyl sales have grown consistently since 2007. This revival created unique supply chain challenges as manufacturers scrambled to resurrect nearly-extinct production capabilities. Test your knowledge about how the music industry managed this unexpected product revival and the complex supply chain issues they faced.

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Shortage of pressing machines (most presses were built in the 1960s-70s and had been scrapped)
Lack of petroleum-based PVC pellets needed for record production
Insufficient cardboard supplies for album covers due to competition from e-commerce packaging
Shortage of skilled lathe operators for master disc cutting