There is a sticky above about a Model 1915 pistol, most is the same with a 1917. There is a section on firing pin removal and that actually was done using a 1917 bolt. All was done using photobucket and they no longer allow the pictures to display correctly unless one gets a paid membership, the pictures have 'watermarks' and the videos do not seem to play at all.

A quick description of the procedure - I removed the pin holding the cocking piece first and put a loose fitting pin in to hold it, this also could be done last.
Remove the firing pin spring retainer by pushing it up from the bottom far enough to get under it from the top with something to pry it all the way out, now the cocking piece, firing pin & spring can be removed.

Now the firing pin can be removed from the cocking piece by removing the pin.

To reinstall put all the parts back in except the firing pin spring retainer and re-pin the cocking piece.

Reinstall the firing pin spring retainer by starting it in until it is stopped by the spring, turn the bolt over and put some upward force on the retainer while using a screwdriver to compress the firing pin spring enough to allow the retainer to slip fully into the bolt.