Hold the firing pin in a vise in the vertical position so the vise jaws hold the pin just below the spring boss.
Place the firing pin spring on the firing pin.
Use the safety shroud to compress the firing pin spring. This will take a little bit of effort to do.
Hold the safety shroud down with the spring compressed.
With your free hand grab the cocking piece and assemble it onto the 6 lug interlock on the end of the firing pin and rotate the
cocking piece 90 degrees and line up the re-cock tung with its slot in the bottom of the safety shroud.
hold it in that position while you de-compress the spring at which point the firing system is assembled.
Next,
leave it standing there in the vise, grab the safety shroud pulling down and compressing the spring.
Have a washer handy and place it between the cocking piece and the back end of the safety shroud.
decompress the spring allowing the washer to hold the cocking piece back.
Next,
This assembly is now ready to be screwed into the back of the bolt.
Do not engage the safety lever, leave the safety lever in the fire position, that position is clockwise all the way down as view from the back.
Screw the assembly into the bolt. At about 3-1/2 turns in it will become necessary you depress the safety shroud lock for the next additional
two turns in as the shroud lock will contact the back of the bolt handle and will need to be pushed back in order to clear the back of the bolt
handle.
Screw the assembly in until it cannot be turned in further as it bottoms out at the front of the shroud flange.
Ensure the shroud lock is engaged.
Remove the washer that is holding the cocking piece back.
For removal of that washer, I grab the bottom square area of the cocking piece in the vise and pull forward just grabbing the bolt itself.
The washer will be easy to remove at this point and may even just fall out on its own.
Let the spring tension down and the nose of the cocking piece will reside in it's out of battery parking spot on the back of the bolt.
The bolt is now ready to go back into the rifle action.
Ensure the claw extractor is in alignment with the right hand or lower locking lug and insert bolt to receiver.
Ensure unloaded condition, dry fire and cycle a couple of times.
engage the safety, pull the trigger, ensure full dis-engagement of the cocking piece from the sear by pulling the trigger.
The trigger and sear assembly should move freely with no contact between the sear and the cocking piece.
Disengage the safety. If all is correct the cocking piece will pick up the sear and hold the FP assembly in battery.
In addition, the Mauser/FN firing pin and bolt are designed in such a manner that the firing pin cannot make accidental contact with a primer for whatever reason while out of battery as the front of the spring boss will bottom out inside the bolt prior to the firing pin reaching full protrusion of the bolt face. The pin is made with sort of clearance cams that clear the internal shoulder in the bolt. This design is done to prevent out of battery or 1/2 battery pin drop to the firing pin and is only indicative to the M98 design.
The only M98 design that does not use this out of battery FP interrupt design is the 1910 Mexican M98 and the 1936 Mexican M98 design.
In your video you showed the inability to rotate the shroud and FP. No rotation is two fold. 1. shroud lock engaged to the back of the bolt.
2 without a cocking piece on the pin there's nothing pulling the FP back on rotation of the partial assembly and it's just hung up in the front of
of the FP boss and the block/pass shoulder design in the bolt.
TMI? probably......
