Once the holes are aligned, push the pivot pin through until flush with both sides of the receiver
While holding the receiver and buttstock with the action open and the breach exposed. Grip the extractor with the thumb and index finger, align the flat screwdriver end of the extractor with the extractor retaining slot, and firmly push forward. The extractor should be held in firmly while moving forward under tension from the extractor assist spring. Close the action (note the action should close with reasonable tension)
Replace the forearm by placing the wings in the rear first and, with an upward motion, locking the forearm in place. The forearm will be held firmly to your rifle while free floating.
Knight Rifles, American Made muzzleloaders.