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			Hello Gav, 
 sorry for not showing You the picture I refer to but I have very little time at the moment.
 Concerning slip joint, okay, let's call it simple back spring.
 I have also a Albacete made Navaja with a simple back spring and no real locking system.
 This back spring holds up on the handle which is made one-piece, so no second pin for the back spring.
 Also this knife has a small hole where You thought a pin should be.
 But when I look at the handle, this hole just goes through the hande but not through the back spring.
 As I mentioned already the back spring only holds up against the handle.
 
 Sory for not beeing able to go on with the discussion but I will be picked up now.
 
 Best regards, Helge
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