Hi, first off I'm a new member and this is my first post.
I have weak hands and the hammer spring in the CZ52 had been very difficult for me to place back in. This may be common knowledge however since discovering it it has helped me greatly and I thought I should share it.
All I did is grid the eye of the cleaning rod about two millimeters back. This makes it the perfect size to hold the magazine catch. Using the cleaning rod to push the magazine catch into the frame is much easier than any other way I've found.
