We got our spring in as well. See link for video showing it is in fact "springy"
https://vimeo.com/199933366
This is an E-41 spring from Century Spring cut to length. Specs match the McMaster p/n supplied. (
http://www.centuryspring.com/extensi...ings-e-41.html)
It is sitting on a spring post made per drawing with exception that the diameter is a tad undersized as the diameter called was difficult to get in the spring (calls for 0.66" when spring ID is ~0.60 )
On that note, the drawing doesn't specify at all how the post is attached to the carriage. I can assume there's a 1/4" bolt and nut holding it in place, but this isn't shown. We also came across the attached picture which shows a clamping shaft collar which isn't shown in drawings or field model. Frustrating when you're trying to make field elements as real as possible.