Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: Does this kit fit a 397?
Document: This kit brought my air rifle back up to new performance. I was actually seeing the pellet drop before I installed this kit. The only negative thing to say is that the tiny o-ring for the loader (lever that is pulled to load the pellet) was a fraction too big and did not fit. I had to keep my old one.
Hope was almost gone. Replacement was fast and easy. Happy shooting days are here again. I give this kit a TEN STAR rating!
This kit was easy to install and it has revived my dying Benjamin. There are a few different kits and it was a bit of a challenge to ensure I bought the right one. OEM documentation is available online.
My Benjamin model 392 .22 cal. air rifle ceased to pump up and hold required air pressure. I researched the problem and found this repair kit. It came with instructions and necessary part replacements. It does take some mechanical skills and common tools to install. An extra hand to help too is useful. My son and I installed in about 45 minutes, so its not too difficult. I have since reconditioned another one for a friend. Rifle worked like new when complete.
You need a good workbench, a quality 5/32" punch, a decent striking device and some patience for this step.The rest of it is pretty straightforward, common sense mechanics, and I was delighted at the simplicity of the cartridge valve once I understood how it worked.Reinstalling those roll pins was slow going/unrewarding when I tried to pound them back in, but the arbor press made quick work of it.
Read instructions carefully and work step by step.
My C9 had started to leak down pressure after pumping, to the point that it would only hold pressure for 10 minutes. I had purchased it in the last decade, so I just assumed that it would have the cartridge style valve and never bothered to check as per Pyramyd's instructions.
I didn't know this previously, which may be why my gun started to leak down after 5-6 years.
Answer: no