Train Hooks from the 1960's x507, x508 and their plates.

[Chris Dee]

I want to see this happen:

Delete all shortcuts with the hook in a "Pulling" position. If a user wants to have that level of detail he can inline
the default part, and reposition parts, and models.
x507c02
x508c02
3176c02

Delete all hook plates/files with different orientation of the studs. Orientation of the logo on the studs differ, over time, on many parts.
737b
737bc01-f1
737bc01-f2
Remove the "a" from all parts using it; 737a, 737ac01-f1, 737ac01-f2

Don't use "1a" or "1b" in the descriptions. There's three diffent versions of the hook. Use "1,2,3" or "a,b,c" instead.
Use a common u-partnumber for all of the hooks.

Massive rename/renumber excercise completed. Reviuew summary page here.