U have to pause the needle. Then return to game and press key ONCE, asap; not spamming repetitively. I have tried 14 rounds so I'm posting needle position for each round. Needle position/round # EES 1, 2, 4, 5, 11, 12, 13, 14 NNE 3 SSE 6, 7, 8, 9, 10 Consistent results. If it's too hard to press fast, consider moving one needle backwards CCW.

I managed to win the rainbow shell by pressing the stop button on the roulette wheel when the red tip of the spinner was about 1/2 way between west & north. Or I was just lucky!

This actually doesn't work. It's random. I've landed perfectly on North using Home and it stops on South, so I'm not sure what you're talking about. Either you're making things up or trolling.

>>3 i've done the same, except i do North / North west. Basically spam A as you go back into the game

>>1 I can confirm this. Spam A from the home menu after catching the wheel point North/Northeast

Is not the same as the pause trick, but if you hold the button after chossing to play you will always get the next direction that the compass is pointing. Ex.: If it starts in west and you hold it, it will always land in north.

Well your research wasn't through enough. On Switch you CAN pause the roulette by pressing the "HOME" button. I literally got the shell a few minutes ago by pressing home, if the compass was pointing at north or between North and East spam A to stop it as soon as possible, got north everytime. Please test this and change the guide.