@Firewuff I have just found this thread and I’ve actually done what you are talking about… however, i removed both springs, glued in a nut AND used m8 threaded rod. Works really well! I used the ball bearing from the height stop disk to smooth the rotation of the leadscrew and act as a bearing. I also ground away the thread at the bottom too… the threaded rod ans motor need to drive the bottom post to stop it binding. Also, if the router dies its only $80 to replace 
Here’s some images…![15239464982731179197854|281x500]
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