...udging from the videos I watched with the rotor/flywheel in place I won’t be able to truly see or touch the spring or doohickey to verify whether it’s already been changed or to check the spring condition. And i wrong?...
Well, yes you are. Wrong, that is. Sorta.
If you watch the videos this is all explained in great and fascinating detail.
To cut to the chase, once you remove the outer cover you can peer into the inner case, underneath the large ring gear, and you will be able to see the lever.
If you didn't adjust it prior to opening the case you will be able to see the lever move when you release the holding bolt, provided there is tension in the spring. If it doesn't move then there is likely little to no tension in the spring.
From this comfortable vantage point, you should also be able to see the surface condition of the lever and the presence of a torsion spring. If there is a torsion spring then there certainly is an aftermarket lever.
If there is no torsion spring but the surface of the lever has a bright machined look to it then it is likely that the lever was replaced but the mechanic was such a cheap bastard that a torsion spring was not used.
This condition usually leads to gnashing of teeth and utterances like "Cheap *$%&#@^%&* asshat!", but a gentle turning of the ring gear in a clockwise direction may improve visibility to the point where the tip of the torsion spring becomes unobscured. If it doesn't then further gnashing of teeth and rending of garments ensues. Grievous wailing may be heard.
It is at this point when the smart and thoughtful owner will do a manual adjustment of the lever, using a screwdriver to push it to the left, followed immediately by an order for the complete kit.