All the posts I have seen on this seem to be about the difficulty in opening or closing the flow frames.
I know things will tighten up after the bees do their thing but I have found opening and closing the frames to take almost no effort. There is only a slight tightness in inserting the flow key in top, if the frame is open and in the lower slot, if the frame is closed. Doubled checked the operation was being performed correctly. Worked perfectly.
Just very surprised it was so easy. Now I can’t wait to see how much effort is needed with a fully capped frame.