I found the fake cherry stem (taiwan's white axis) to not fit with cherry keycaps.
http://geekhack.org/showthread.php?t=9256&highlight=fake+cherries
Hi elbowglue, I have read your post about the fake Cherry switch issue of Chicony 5191.
I found a
discussion (mostly in Chinese) in July 2004 in which a member mentioned this issue in English (page 1 7#): "There are some variations of KB-5191. Variations are 1) Real cherry switches MX/Blue, 2) strange MX/white but click tactile like Blue, 3) fake SMK key switches 4) Fake Cherry switches. And maybe more ... Don't know if there is an ALPS switch version. ", this member, namely Sandy, said she had a similar experience like yours:"I also have a Chicony KB-5191 with that fake Cherry switches. ... ". I will try to find more details tonight.
But these white switches may be different from the Chicony KB-5191's somehow, or at least a new generation, I guess.
Please let me know if I can do more on this, I will be very happy to do : )