hey pps im having problems putting the piston locks in. it not a c-clip. its like this spiral thing. i followed the instructions from the web and it just doesnt want to go in. i can get it in about half way and then the it stop turning in. its like it starts to hook on something. and i dont wanna force it , in case it breaks. any help would be appreciated

 

Push it in with a screwdriver, follow the circle all the way around with the screwdriver.