So ok, I have been biting my tongue... but there is a way.
Depending on the tube and yoke. If the yoke is not bonded, loosen the yoke clamp, break any seals such as silicone on the rubber wedges.
Now rotate the yoke 90 degrees.
Adjsut the vertical and horizontal size... butv expect that when you adjust the horizonatl size for proper proportions, that you will have black on both the left and right sides.
Probably not the best solution as when you switch back to Horizontal games... the game is not oriented right.
Not for an amateur who worries about high voltage and such, but not all that hard, it takes me less tahn a couple of minutes.
Good luck