I wanted to chime into this thread to share that I received my replacement drum and successfully replaced the drum on my R2. It was a great improvement for me. Though I hear occasional knocking (especially with larger batches of large seeds i.e. Pacamara) I haven’t had any issued with the drum opening since season roast #3.
I did have a little trouble with the disassembly and assembly following the video, but there were minor moments while following along. A few times I replayed sections and froze frames and eventually got it figured out. It wasn’t 100% accurate to my R2, maybe 95%.
The biggest challenge in my case was the shims. The shims were factory installed with the sharp edge away from the bearings, so I corrected that as instructed. I had to play with the count of shims front and back in order to find a sweet spot with the drum so that it wasn’t rubbing the front plate. I believe I ended up with no extra shims on the back and 4 on the front and finally was able to achieve what I needed.
I hope this is helpful.