I think the all-thread tube would be considered a Up-grade design.
I changed to them when I saw that they would be easier to position than the old design.

On another 3D forum website several said they had changed to that type, so I got some also.
They are available at eBay.
I think the newer model CTCs come with that type but not sure how many new makes and models do.

I agree completely on the installation procedure.