To me, with no knowledge of the deep lore of keris symbology, the ganja can represent a saddle in that it is a transition point from vehicle (handle/hand) to rider (blade). So instead of a stone as an obstruction between butt and seat perhaps, in this analogy, the stone can be the rider itself at this transition (beginning) point where servant stops and master starts which is clearly a place of power. However as, presumably, the ganja is not called a saddle in other contexts this interpretation is quite a stretch but can point to how saddle and beginning can be synonymous.
As an aside I did a Google image search for Batu Lapak to see examples and found that it also refers to an unusual hard scale at the base of some chicken feet. If the Google translate captures the meaning correctly it is believed to provide a major advantage in a cock fight in what seems to be somewhat talismanic manner.
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