It's about time someone posted a clip like this because too many clips feature girls in such loose bondage they may as well not even be tied down. I'm with Isabeau, the X-frame works best. Ticklehorror did it great in the Jackie Lister clips, where she was tied down by her wrists, elbows, ankles, and knees. TC video's tickle board, which was used in videos like TC 5334 and 5335 to tickle Angel, was perfect (though any video with Angel is perfect by default) especially since her feet were left hanging off the edge. The thing that was used in Jasmine Seever 1 and 2, as well as the Bandit device in Jasmine Seever 5, were also ideal devices, mainly because they tied down more than just the girl's wrists and ankles. That's the main secret, if you are going to just tie a girl down by her wrists and ankles, then make sure she is so stretched out she can't even move (I don't know if that would be painful or not, which is why I reccommend the multiple-restraints option). Which is why the mainstream producers have better videos than no-name amateurs. They can purchase and store better equiptment rather than grabbing a couple of neckties (not to mention the fact that the amateurs on average use HORRIBLE video and sound quality).
Alternatively, any original device by Dave2112 almost automatically kicks ass, if only they were real devices.