Z axis rod holes

I guess I missed it in the instructions, but I saw a picture of the z-axis rods with holes drill in them. Is this listed in the instructions somewhere where to drill these and what hole size/bit size is needed for this? Can someone point me in the right direction? Looking for where these holes should be specifically, and how large a hole size.

Thanks in advance!

Sorry I should put it in both places.

Bottom of this page.

https://www.v1engineering.com/assembly/conduit-rails-tubes-pipes/

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Ahh, thanks much!