"... thx, but not a speedy way."
Just to be clear, you changed your images after I replied. I was responding to the vertical slot and using boolean diff to create it.
If performing a simple boolean operation is not speedy enough, then I don't know what is.
To address your latest images:
I would have created the cylinder in MoI with the horizontal groove in a single operation using Revolve with a profile curve that included a notch for the groove.
Then create each vertical groove by extruding a rectangle and Boolean Diff with the cylinder.
Practice will make very speedy.
Ed Ferguson
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