i don't have the 51, i had a 42 and now use a Kimura. however, i was seriously considering a 51 and (as a result) have watched/read a handful of reviews. from what i've gathered - not only is the clip removable (without any effect on the spring latch), but also can be switched from side to side on that handle. it can NOT be moved to the other handle. i could be mistaken, but that's what i recall learning, while trying to decide whether or not to get one. also - everyone says that it is lighter than the model 42 which was pretty light already.