Your agreement isn't required.
I have worked in EVA for 25 years, and Hubble does not meet any requirements for EVA serviceability. The fasteners on the external panels are not captive. Just review the video of the crewmembers trying to corral the screws. The internal components are not designed for EMU glove access. None of the internal interfaces meet any of the requirements for EVA access or work.
Lockheed designed a complete slate of specialized tools to perform the work. That is the only reason for the Hubble EVA success.
My source was Wikipedia
https://en.wikipedia.org/wiki/Hubble_Space_Telescope, which states "Hubble is the only telescope designed to be serviced in space by astronauts"
and
a Hubble website
http://hubblesite.org/blog/2011/07/thank-you-very-much-for-the-ride/, which notes "Hubble was also designed to be serviced by shuttle astronauts, a feature that has been crucial to Hubble’s success and longevity."
and
NASA itself
https://www.nasa.gov/mission_pages/hubble/story/the_story_2.html: "In regards to the maintenance and upgrading of the space telescope, plans were made to conduct servicing missions in orbit ", and " The aft shroud was modified to make instrument replacement during servicing easier."
OTOH, your experience, which is very significant, indicates that the serviceability of the Hubble may have been far less than ideal. Perhaps, in the early 1980's (which is when the Hubble was designed, and which pre-dates your experience), the concept of "serviceability" merely meant modular construction, but now means so much more.
Has the experience from the five Hubble service missions helped to establish better EVA serviceability requirements?