For those interested in The Extensionator, there's a video online showing it in use. For me here in the US, the video is the first one that appears when you go to Youtube and search on "The knee extensionator". It might show up in a different order in other countries (I have no idea).
@luvcats , I have been doing a similar thing on my recliner from the start, keeping my leg as straight as I can while the recliner is in the "legs up" position and even leaning forwards sometimes. But I can only do that for so long, and not continually or it gets very tired and achy and I just have to quit. I think that probably I will benefit from the stretching you describe and from any kind of gentle stretching that I can get. One thing I like about "The Extensionator" is that it very carefully and firmly holds the entire leg in a certain position so all the soft tissues get stretched, not some at the expense of others.
Last night I had to take 5 mg hydrocodone to get to sleep, because the (mild) pain, plus zingers and occasional muscle cramps were keeping me up. I am sure that nights like this sound all too familiar to everyone here. I had lots of the internal discussion, "Should I take a pain pill? Should I not?" because the pain was totally bearable and mild, but then I couldn't sleep. So I finally gave in and took one. I was a little bit mad at myself about taking hydrocodone, because I broke my "17 days with no pain pills" streak.

But then, that is what they are for and I reminded myself that recovery is not a contest.
I should keep a giant sign on my wall right in front of me saying that:
"Recovery is Not a Contest." in letters 2 feet high. Then maybe I'd get a clue.
Anyway, due to the hydrocodone I slept for 7 hours straight which was utterly blissful, and my knee was busy healing and un-swelling while I slept so it feels better today. I think I will spend most of the day resting, icing, and elevating, though. Then hopefully tomorrow I will be 100% back to normal, and on Monday PT again.