I wondered the same thing..
but it seems the originals were like that as well..
SW200D is the part# (ball bearing type)
the other is a SW-18020P (nail & spring type)
Im still curious as to how Hasbro, Master Replica, and other regular EE's work with these sensors to only trigger on a SWING event..and NOT a simple 'tilt'??
timing is the only thing "I" can think of.. but who knows! lol
thanks