I’m new to this forum and new to CZ but am not new to guns. I have many and have for a long time. Yesterday I got a brand new 75b omega convertible from a seller on gunbroker. I shot about 80 rounds and it was great. About an hour later I was showing the gun to my son and the decocker stopped working. I discovered the plastic spring retainer on the decocking shaft was in pieces. The decocker will not function. The lever moves but nothing happens. I then removed the decocker and tried to install the safety. I could not get that to work. If I push the left and right side pieces together, it just seems to be bound up and will not function. Thanks for any advice you can provide to me.