PTFE Tube Comes loose at hot end

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I just upgraded my A1 to an AMS2 Pro from the AMS Lite. Now the PTFE tube won’t stay in the buffer at the top of the hot end. I’ve trimmed the tube to make sure the end is square and clean. I’ve tried another tube. I”ve tried different inputs on the buffer. I insert the tube and it seems firm if I try to pull it out, but after a few filament changes, it comes out.

Assembly Guide near the bottom, bend the metal tines up.

Thanks, I found the wiki entry and followed the steps. I did mange to break one of the clips that holds the top on. It looks like it will still work, but the replacement adapter is only $5.99 US, so I’ll order a replacement.