I recently got 3 HP Combi-plan 4x5 tanks and I'm going to use this tank mainly for semi stand development.
I learned how to agitation when using this tank as a daylight tank on YouTube.

By the way, I wonder how high the film carrier should be lifted when initial agitation in the darkroom.
And do I need to tap the film carrier against the inner wall or top outer border after the initial agitation?
Also, I'd like to know the internal thread size of the outlet at the bottom of the tank.

I would really appreciate your advice.
Thank you.