I THINK my issue might be fixed if I used your stabilizer that came with my keycaps but I am not sure what to do to remove the old ones I have in currently. The reason why I believe it might fix itself with your stabilizer is that these same keys seem to work fine on a keyboard where I am using your stabilizer.
For example the keys with the issues I am having are all for the keys that are using the white stabilizer: Backspace, Enter, Left and Right Shift, the 0 Ins key on the numpad.
EDIT: YES IT FIXED IT! The white inserts from Unicomp are not compatible with your Keycaps btw. The Black Unicomp Inserts work fine with your keycaps but those are just the vertical keys.
And the way i removed my old Unicomp inserts was with 2 screw drivers that used to come with IBM computers from the 80’s and early 90’s and they fit in those barrels to pry them out without damaging anything. Not sure what these screw drivers are called… but I remembered they came with computers back in the day
For reference (not sure if this is the proper way to remove them, but this is how I did it….. seems a bit dangerous but i just did it really slowly to make sure i didn’t break anything):
Not to worry, this should be fixable without having to take apart the keyboard.
Please read the manual fully before setting up your Brand New Model F Keyboard, as indicated on the first side of the green booklet printout.
In the manual: Initial setup section, point 7 might help with your question.
I recommend using the new production inserts with the new production keys and other inserts with other keys.
The manual is on the project web site – the “Manual” tab 🙂
Sorry I missed the section, I see it now. I may have to pick up the Wilde Tool G407 as mentioned on it! Thanks again for the help

I think I mis-placed the manual already… =( The only thing i can find from the original packing is that dot matrix paper (nice touch btw)