Reck police, help required.

[chip]

I bought a umarex reck police today and on getting it home discovered that the decocking lever does not work.

In the manuel it says once the hammer is cocked (fig1). To decock or safe it use the decocking lever.
Push the decocking lever into the lower position as shown in figure 2. The hammer will be decocked and placed in the safety notch.

Now when i cock the hammer then push the decocking lever nothing happens.
But i have noticed that if you hold the decocking lever down then pull the trigger the hammer releases but stops short of the pin, then closes the rest of the way as you release the decocking lever.

There is no mention in the manuel about having to use the trigger whilst decocking.

Please help.
regards chip