I have a never used Maslow kit that was purchased in March of 2018. The kit includes all original parts - most never opened. I did open the ESD bag for the micro controller and motor power supply, but I sealed it back up and never used it. The kit includes the metal ring.
The Z-Axis has the .375 in, ⅜ in coupler that works with the rigid R22002.
I also have a new Rigid R22002 that is opened but never used. If you’re interested in this, let me know. The router is not included in the price mentioned in the title ($425).
I bought the kit but ran into some medical issues that has prevented me from using it. Hopefully my loss can be your gain.