Take down lever spring
 

I've been trying to install a take down lever spring in a WWII era Mauser P08. I made a small punch to fit the hole in the frame and had no trouble driving out the stub of the old spring. I could not get the new spring seated all the way down. The pin on it goes half way into the frame without too much trouble but then it gets stubborn. I tried inserting the pin from the outside of the frame with the same results. I suppose I should get the micrometer out and measure the pin.

Is there a trick to this or do I have a poorly fitted spring?

I sometimes chase it with the TD it's self and as I am installing it in place it will snap in place....check the whole for dirt and also try from above it, using a small bit of pressure get it to go in.....

As Howard says, can be tricky. I have added far fewer than him, but can say, they are tricky, popping out and not wanting to go in!