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|Hammer cocked||Hammer uncocked|
Next, point the still empty pistol downward (at the floor) and pull the trigger. You want the hammer to fall to its "fired" position. It is possible that you may have to help the trigger a bit....a little nudge with a toothpick worked for me. You can reach it through the opening in the back of the frame since the mainspring housing has not been inserted. You can clearly see the difference in the above two photos. The hammer strut sits much lower in the frame when the hammer is cocked.
Insert the mainspring housing pin into the receiver and push it straight up through the holes in the grip frame and into the top of the receiver. As the mainspring housing pin is pushed into the receiver, it passes through the slot in the bolt and also passes by the rear end of the recoil spring guide, slightly moving the recoil spring guide forward to put initial tension into the recoil spring. The mainspring housing pin will protrude about 1/8" above the top of the receiver once it is fully pushed into position. During this step, be sure the bolt is fully forward and the hammer is still in the fired position.
**Point the still empty pistol down toward the floor and pull the trigger while shaking the pistol. This will help ensure that the hammer has fallen "forward" into the fired position.
With the pistol lying on its back, adjust the angle to slightly elevate the muzzle causing the hammer strut to fall back. You may need to a gentle shake to loosen the hammer strut (or that toothpick I mentioned earlier). Do not pull the trigger.
The mainspring housing latch is now ready to be swung shut as shown in the above photo. It is VERY important that the hammer strut comes to rest on the mainspring plunger as the housing is closed. The mainspring plunger lies inside the mainspring housing and may be seen through the slot in the upper end of the housing.
If the hammer strut does not contact the mainspring housing as the housing is swung shut, it will either be impossible to complete the closure of the housing or the housing may be closed but you will not be able to draw the bolt back all the way. It is also essential that the hammer itself be in its uncocked forward position (resting against the firing pin) as the mainspring housing is swung shut. The pistol should be lying on its back with the muzzle titled up at a slight angle to cause the hammer strut to drop into the correct position to meet the mainspring plunger in the mainspring housing.
Close and latch the mainspring housing by pushing the latch into
its original position. Last but not least, test the reassembly.
Gently pull the bolt back (do not force it). It should be no more
difficult to pull the bolt back now then it was with the previous barrel in
place. If you can not pull the bolt back, it is because the hammer strut
is improperly positioned. If this is the case, open the mainspring housing
and return to the step above marked with a **.
There it is.....all back together and ready to be taken to the range or out
to the woods where some fun can be had.