[jome]

SanderP, sounds like you got the right idea. It's hard to explain, but I would not obsess about the tongue so much. At least the Frenzel I do, I don't actually move the tongue that much. The block is the most important. I think the actual pressure buildup is a combination of things, but I move "something" in my whole throat, my adam's apple bobs visibly and I also squeeze with the cheeks I guess. In fact, I don't move the tongue much at all, the movement is very subtle, almost unnoticeable.

So I would suggest just make sure the block is in place and play around with the air in your mouth and try to find what you need to move to get it in there. If you're doing everything else right, my guess would be that once you start playing with the tongue, you unconciously close the soft palate.