No knowledge with these but I have this (poor quality) phot:
View attachment 59584
Regards your phot, can you tell me how the bolt handle is secured? It looks like there is a retainer at the base of the handle.
Since, in the phot above, the bolt handle has been removed I would presume that that is integral to dismantling the bolt. The slot in the base of the handle, which is roughly the same diameter as the waisted section of the firing pin (aft of the spring retainer), suggest that it is the bolt handle which keeps the firing pin in place when the action is open. Obviously the rear lug on the cocking piece does this in addition when the action is closed.
However, I await being proven wrong.