Hi Cathey, 
Currently i don't find any other post or thread in this forum on this subject ... although possibly they exist. But i guess i have seen other examples in different sources but, i don't remember where. 
You mention their history. What angle of history would you expect to read about ... the need for these swords ? 
Concerning mechanisms, i wonder if there are more than one; possibly. I didn't see how this specific one worked in the begining, when looking at the small unclear picture in the book, but now i think i got the correct idea: 
 
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						Last edited by fernando; 9th April 2016 at 05:56 PM.
					
					
				
			
		
		
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