On Tuesday, October 10, 2017 at 9:07:03 AM UTC-4, wrote:
The integrity of the hinge can be verified by gently pushing up/down and fore/aft at each hinge post. Lubrication can be done by sticking spray-lube tube under the Mylar at each hinge.
JJ

I do the same except use a small hypodermic needle to put a small drop of oil in the hinge. Less messy than spray lube for most people.
UH