The one-wheel manual will demand some patience before you execute it cleanly, but if the Manuals are your daily bread, you will be fine! As is obvious, we are talking about the manual executed on just one wheel.
I will try not to sound too complicated, so we will get straight to the point.
First, find a nice manual spot that is low enough that you won’t struggle with basics like getting on, etc. Then warm up with some regular manuals to get comfortable. The balance will be the key here so the first thing you want to do is to tighten your back kingpin as much as you can so that the back truck is nearly stone locked. This will help you keep your balance and prevent the wheel bite.
Before attempting any tricks, practice balancing on one of your back wheels. Shift your weight back and forth between the inside and outside back wheels to see which feels more natural. You can do a one-wheel manual on either the inner or outer back wheel, but in both cases, you’ll need to find the perfect balance to stay on one wheel without dragging your toe or heel.
Once you figure it out, just go for the trick. Get enough speed, and pop on the manual pad like you will do a regular manual. Before you land into manual, lean your body weight on your back foot and press down hard to lift the outer back wheel. If you want to do it on the other wheel, lean to the front and press down with your toes to lift the inner wheel. In both cases, set your back foot just where the tail concave starts.
The last step is to keep the balance, which is a bit harder than with regular manuals, and the toe or heel drag are constantly there, so it can take time before you make it clean. Keep your body weight mainly on the back foot, so it lets you control the direction. Otherwise, it’s hard to explain the best way to balance, because when you’re in a one-foot manual, it feels like you’re balancing in every direction at once.
Landing is not much different than in a regular manual, so this is the easiest part, and it will come naturally. Just keep body weight on the back foot until the very end and then just drop it like you normally do.
This should be the next check on your trick list so… have fun!