Plunger from Seimitsu PS-14-KN will not work with the Sanwa OBSF-30.
Look at this:
Sanwa OBSF-30 Base; Sanwa OBSF-30 Plunger; Seimitsu PS-14-KN Plunger.
The rectangular hole that hits the Microswitch is different on Sanwa and Seimitsu.
Seimitsu is 90° different from Sanwa.
The rectangle hole on Seimitsu is smaller than Sanwa too.
Enlarge the hole on PS-14-KN Plunger somehow and rotate Plunger 90°.
Now knowing that, you probably say, “Then can’t I just use the Seimitsu Microswitch on Sanwa Button? That way I can use Seimitsu PS-14-KN Plunger?”
No, that will not work.
Want to know why?
The Microswitch on Seimitsu PS-14-KN is much bigger than Microswitch on Sanwa OBSF-30.
But get this.
Seimitsu PS-14-K can take Sanwa SW-68 Microswitch.
SW-68 is Microswitch use in Sanwa OBSF-30, OBSN-30 and some.
Seimitsu PS-14-KN can take Sanwa RS-SG Microswitch.
RS-SG is Microswitch use in Sanwa OBSF-30RG, OBSN-30RG and some.
Give that some thought.
Now would that allow Sanwa OBSF-30 Base to take Seimitsu PS-14D and PS-14-K Plunger?
PS-14D is Microswitch in Seimitsu PS-14-K, PS-14-D, PS-14-DN, , PS-15 and PS-14-P.