Also, someone on r/MK said this:
ATTENTION:
I talked with the maker before, the switch of shift and enter keys are not the same as the one in Novatouch.
For this one, there is no stabilizer, but only a MX port.
For Novatouch, there is a stabilizer, you can drill a hole on your HHKB/Realforce to support the shift/enter key.
Therefore, if you use this one to replace your shift/enter key, the keycap will be stuck after you press it down, because of no stabilizer.
Would this be something we would have to think about, even if we did modify the stems on our stabilized keys?
i have no idea what they are talking about or referring to
i have extensively tested the sliders and they do indeed come with stabilsed sliders and worked perfectly for me
edit - the only issue at all i found with the stabilsers is some keys had a very slight clearance issue, they would function perfectly, so no sticking whatsoever, but were maybe a mm higher than the other keys of that row
for keys i had that issue with, i didnt drill my case at all, but i removed a very small amount of material from the 2 stabilised sections of the caps, its very minimal and if anyone is interesting ill document me doing it when the new sets arrive, this wasnt an issue in all sets i tried, but the ones that did present a slight clearance issue, it was very easily resolved and the amount of material i needed to remove was so small the caps still functioned perfectly again on mx stabs
but i have tried SA, oem, dcs, gmk, dsa, jtk on these sliders, and havent had a need to drill my case in anyway whatsoever and have full functionality of those keys and all profiles at the appropriate height (with in some limited occasions about 30 seconds of work on the bottom of the caps)