my front setup on my mod is the same as flipps,and I can manual forever. In fact, I learnt to manual on a trials bike, I wouldn't be able to transfer the skill over from say a mountain bike as manualling a mod is completely different. If you're learning, rock your weight forwards, (dip your knees) and pull back, arms straight, and try and get your arse nice and far back. Try and get it to flip over, "loop out" as its called so you have to bail/jump off. If you can get it so it loops out, you can get it to manual. It's just time and practice practice to find the point where it doesn't drop down and doesn't loop out, and keeping it there. Once you can hold it there for a few seconds, the rocking of the body starts to come fairly naturally. Front end goes too high, bend knees to bring weight forward. Too low- push with your legs/straighten them to bring it back. It's just practice until your body does it without thinking. Hope this helps