I can't argue that what you're pointing at is a roll pin, that's pretty obvious. In fact there are TWO roll pins, one on each side and they do NOT meet in the middle.
But there is a clutch/release/ratchet mechanism inside the stove knob. They are actually quite difficult to disassemble but it's really easy to demonstrate the release/re-catch by clamping the key in a vice and turning it. Note the video and I'll thank you in advance for your apologies...
https://youtu.be/Hulec8ZNLJo
I apologise, sorry for not explaining further, but I do thank you for the video.
I never tried to force the key, was not willing to damage it prematurely on my part.
I will explain tho, the year I bought my bike, and had the rear brake lever warranty failure, I was talking with the service tech in the showroom, and he asked me about a knob failure.... someone sat on a bike and twisted the knob, reallly hard, and it failed internally, and they couldn't remove it.... I did spin it a coulple times, smacked it with a rubber covered screwdriver handle, and it still spun freely, absolutly no resistance. All I could suggest to him was to try to compress those roll pins in with a C clamp, and see if it had any effect, and if not to jamb a small nail in thru the center of the pin to see if he could get it to wedge up enough the function it.... they were pretty bummed at the time, because they had a buyer for the bike, but couldn't finish the prep....
ouch.
I had to leave and never followed up with them about what broke, This was wayyy back in time, and I posted that picture and asked if anyone had disassembled one yet, I guess nobody has, id like to see the insides, but won't risk damaging one to find out.
after watching your video, I'm figuring there is simply a spring loaded disc inside, with 2 grooves, that cradle the roll pins, seems simple enough, and would offer that resistance seen.
I figure the one I saw had that disk fracture/split, or the spring popped, or both, as the knob spun free, you could push it with one finger.
thnks again, and sorry for the miguidance on my part.