Ah ha! I see they've changed their design in that regard (amongst others). I was thinking the bottom mount for the spring was cast as part of the upright on the old DW pedals, and indeed it was, (the new ones are a threaded insert). It made it a little more involved separating the two than a simple removal of driveshaft and swapping beaters. You couldn't keep the slave spring on the slave unit like Axis pedals (and apparently you still can't?), so you had to move the spring over each time you split them, and back again to rejoin. And that was no easy task since you had to unscrew the spring retainer out of the upright each time.
Not to mention that there was so much flex in that combo base plate that the slave pedal felt like mush. And to think that was "cutting edge" at the time.
View attachment 94765