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In the case of the Raptor double pedal, both the slave and master pedal had single supported axles for the beater holders, with the master pedal's axle being longer and therefore having a greater moment on it. I'm not sure which side was prone to failure. I'd assume the master side as it gets more use. They didn't bridge the gap like they do on their other pedals.
The problem is the single Raptor did not have these issues and it was also discontinued. It was also looked at as being a wanna-be Falcon, even though you have to modify the Falcon to be DD. I think they could've relaunched the double on a proper chassis and kept producing the single along with it. They had to recall the Falcon for redesign. They could have done it with the Raptor.
Quick note: It appears the same drummer in the video above switched to the Trick pedals. Maybe his Raptor failed, or maybe he found some $$$ lying around. I watched some more of their videos and the new drummer is a much different looking dude. But he's gone now too.
One can never be too critical of a product. If the laws of physics says a design will work or not work one way or one will last longer designed one way vs another can lead to better long term decisions on purchasing really about any physical product. IMO only the length of time tested products determines the quality/length of ownership of a product and usually those products have a better engineered design that's standard for durability. Take for example the discussion in regards to the durability for the slave on a double pedal and whether or not the beater on the slave pedal is mounted on a single or double post.
One might be able to say that a single post slave is stronger due to the shaft being almost entirely in-cased on top of the fact the beater shaft itself is shorter. which makes it stronger in theory as to compared to a long shaft the same diameter. In short, what appears up-front to may not be/look as strong if it's a single post however, looks may be deceiving