Pull the rack back toward you and turn it or even flip it over until you find the side that all the ball touch. Then push it forward to the spot.
IF all the balls won't touch no matter which way you turn the rack, try moving one of the front two balls to the back and replace with a different ball.....
If that does not work find a different rack...
Once you found that part of the rack...make note of which way it is turned...(you might even see a notch mark in the rack from someone prior that has found the best way to turn the rack)....
Once you have found a position that all the balls lock up, now just push it up so the one is as centered as possible on the spot. as you move the rack up a bit the 1-ball may move off the rack a tiny bit...just push all the other balls up to it...
Usually...the base of the 1-ball will need to be a little high on the spot, but as long as the base of the 1 ball is touching the spot...its a legal rack.
IF you can't get the 1-ball to stay frozen...pull the rack away and rub the spot with the palm of your hand....or get a damp cloth and rub the spot firmly to re-smooth it a bit...
If that does not work...It is time to announce..."I can't get them tight"...do you wanna try just racking them for yourself?
I have only had to ask that to one person in my life, and that was only because ....If he did not make a ball on the break...(no matter how well the balls spread) he felt like you gave him a rigged rack...or were moving it on the spot in order to keep him from making the wing or 1-ball.
I guess I have racked way too much in my life....