The gas was perhaps a little high, as I was afraid it might go out. That's a thing I will have to learn over time.
I had to cut the pipes. Took a dremel and cut them 72 mm from the top of the chimney when the smokebox stood on the frame, where it should be.
Then I used a small file and rounded the edges of the pipes slihgtly, and took out the grades from inside the pipes. The chuffer was put in place with not much effort, and then I tapped it gently on top till it sat tight. I lifted the front of the engine from it, and it sat firmly. It was easy after watching you doing it in your videos. Thank you! The chuffer sits almost level with the chimney. I also gave it a bit of black paint on the top.
So now I wait for summer, tracklaying, and putting some load on the Argyll. Then I think the chuffer will sound just right!
But I noticed there was som steam from underneath the front of the engine. I suspect I must tighten some joints there. The nuts where the rods comes out from the cylinders were very loose, and I could turn them with my fingers. A bit of work with a spanner, and I think the joints will be fine.
The faulty pressure gauge will be changed for a working one. My dealer will see to that next weekend when I meet him on a MR-fair. He also mentioned something about changing the RC. So there we are then, a little bit of progress!
Have a nice day!
-Rune