Socket Obscura - Weird Spinny Aircraft Spark Plug Socket

Today we're checking out the Snap-On NAF-1110-14-USN, an unusual WWII surplus spark plug socket, which features a rotating collar.
Can we figure out what it's for??

The socket at Epstein's:
https://www.harryepstein.com/products/11-16-snap-on-spark-plug-socket-with-rotating-collar

Bureau of Aeronautics Tool Kits Book:
https://www.google.com/books/edition/Basic_Table_of_Commissioning_Allowances/qZsVmF3XMFYC?hl=en&gbpv=1&dq=NAF+1110-14&pg=RA6-PA6&printsec=frontcover

Spark Plug Chart:
https://i0.wp.com/parrysvintage.com/wp-content/uploads/2023/05/document_2023-05-22_140912.jpg?fit=750%2C1061&ssl=1

AY-4 Plugs listing:
https://www.rcgroups.com/forums/showthread.php?2528231-Box-of-10-Vintage-Champion-AY-4-Spark-Plugs-For-Piper-Cub

Chapters:
00:00 Parody Intro
00:20 Overview
01:37 Researching
02:08 What Toolkit was This In?
03:18 What Spark Plug Fits This?
04:05 Outro