On any curve there must be a point of balance, dictated by the weight of each end. Unfortunately I can not access any of my long Jambiya at present to check this out, but I suspect that each will have a point at which it balances on the edge. 
 Maybe Lew could check out one of his to see if my theory is correct?? 
Regards Stu
		 
		
		
		
		
		
		
		
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