BOY was I wrong
please ignore this post I simply read the z slider shopping section wrong. I read it as if it were saying the mount was not included instead of the spindle was not included.
Thanks anyway I will try to be more careful in the future.
I am asking because it says one thing in the z 20 slider shopping area and something different in the other… Z-20 (heavy duty z slider)
The newer Z-20 heavy duty Z slider comes from the factor with either a 65mm or 80mm mount preinstalled. The 80mm mount alone is not sold separately. That means, if you purchase a 65mm mount first then decide you want to change to an 80mm spindle and need an 80mm mount in the future, you have to purchase the whole z-20 z slider assembly, and that is costly.