For those of you interested about the "slight-movement", mine has this problem as well along with few guys on the tremol-no forum, along with Dan here. It has to do where the tailpiece (that grabs the tremolo block) and receiver meet. There is a hinge there that should be tight, but apparently isn't on a few units. Others have reported zero movement here, and so it seems like a few units just got messed up (as expected with any mass production of a product). Allparts is already sending me a replacement unit free of charge, so i'll put up my review once I get mine fully working.