In our house we had six remote control units - us kids - we had to sit in a rickety old chair next to the TV and change channels on command...and we only got 4 channels! And God help you if you messed with the vertical hold button by accident.
Good times!
When I was a tyke I would use the horizontal hold to roll the frames until I found the best one.
“There is nothing wrong with your television set. Do not attempt to adjust the picture. We are controlling transmission. If we wish to make it louder, we will bring up the volume. If we wish to make it softer, we will tune it to a whisper. We will control the horizontal. We will control the vertical. We can roll the image, make it flutter. We can change the focus to a soft blur or sharpen it to crystal clarity. For the next hour sit quietly and we will control all that you see and hear.”