The first thing to do is to determine if the gun actually has its set trigger disabled.
Without being sure of this, we are just guessing that it has.
The first thing to do is to check out the triggers.
With the cock(hammer) in the fired position pull the rear trigger until you hear a "click". Then, pull the front trigger.
It should release the rear trigger with a definite POP or snapping sound.
Doing this with the cock in the fired position will not damage the trigger or the lock.
Doing this with the cock at "half cock" can break the sear or the tumbler so don't do that.
If the set trigger will "set" and release, it is working as it should.
Next, pull the cock up just to the "half cock" position. Upon hearing a small "click" it should stay there. This is true with or without a fly in the tumbler.
Now, pull the cock up towards the full cock position.
With your thumb on the cock, pull the front trigger to release it.
Using your thumb to keep the cock from free falling, allow it to move back towards the half cock position.
When it reaches this location there should be a slight pause or slowing down but the hammer should continue to fall to the fired position.
If it does fall to the fired position, the fly is in the tumbler and it is doing it's job.
If the cock stops at the half cock position and a LIGHT pull on the front trigger won't release it, the fly is missing.
If the fly is there but it is not working, set the cock at "half cock" and remove the lock from the gun.
(Unscrew the lock screw a few turns and lightly tap the screw head. This will move the lock out of the mortise.)
With the lock removed you should clearly see the small pointed end of the sear (on the part with the 90 degree arm sticking out away from the lockplate) engaged with the half cock notch in the tumbler.
As you are looking at this you should see a very small, pointed object right under the plate that covers the tumbler and the sear pivot.
It will be resting on top of the sear.
This is the fly.
Now, pull the cock towards the "full cock" position.
As the small pointed nose of the sear gets to the full cock notch, the fly (if it is there) will pop forward and the sear will enter the full cock notch.
If the fly is not there, the only thing that will move noticeably will be the tumbler and it will rotate until the sear reaches the full cock notch.
Upon reaching the full cock notch, the sear will move inward with an audible click as it enters the notch.
Pushing UP on the sear arm will release the cock.
Get a good grip on things and push the sear arm up.
Watch the nose (pointed end) of the sear as it rides against the outside of the tumbler while the cock falls.
If the fly is in place, yo will see the nose of the sear climb up the rearward surface of the fly and hop over the half cock notch.
The cock will continue to fall.
If the seller did remove the fly from your gun before sending it to you, he sold a defective gun and should be responsible for fixing it.
He also needs to be identified to our members so they don't make the same mistake that you did.
Removing the fly in no way makes the gun safer so this is not a legal issue.
The issue is someone intentionally selling a defective gun and his identity should be revealed to us.
