You can buy the knuckle separately. Unless I was the exception (no comments, pls). I bought a new kawi knuckle for my new fredette kicker.
Read the instruction sheet that comes with the kicker!! If you don't get a sheet with it, call them and have them send you one.
If you don't follow the instructions that come with the fredette piece, there is the possibility of considerable engine damage!
No, it's not the kicker's fault..but something with your bike that may make the new kicker have a problem.
Have fun with the o-rings!!