ホモテナシ

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Invented by 円能斎
The official way, of course, is to buy a specific tray: the 円能斎好み山道盆(やまみち) (not written 山路 like the sweet). I have no love whatsoever for that tray; I think the 千歳盆 lid is just fine.

There are two ways you can do the 点前:

Facing the 瓶掛. In that case, 建水 goes directly where it's going to live and doesn't move during the 点前 (🅰️)
Slightly facing the guest. In that case, come in with 建水, face the tray, shift the tray (and yourself), then move the 建水 to the 炉 position. In that case, 建水 moves before you clean the 茶杓 (🅱️)

Because the 茶碗 sits on a (conceptually) lacquered surface, you do 茶筅通し with L holding the 茶碗 from above.
The closing is: move 薄茶器・ポンポン, and then close 鉄瓶. (This somewhat corresponds to the more informal 中仕舞い. In 本仕舞い, you'd ポンポン, then move the 道具.)
宗室 notes: Because it's such a simple 点前, there's no need to move away from いまえ when you leave with the 建水; but acknowledges that a lot of teachers teach it that way (including the new books). (Chanoyu Handbook One, 1980).

It's also quite possible to do it with a 釜, bringing in 柄杓 and 蓋置 with the 建水. Quite a few teacher use this uncanonical form to get students used to the 釜 without introducing all the additional woes 運び brings.
In 炉, however, things get a bit muddy, so this is my conjecture:
- 🅰️ If you want to stay in 略盆 country:
  - come in with the tray facing NE, and then id. with the 建水, putting it where it needs to be.
  - Like this 建水 doesn't move, nor does the 盆. In that case, there's still the question of when to unload the 建水.
    - I'd unload the 建水 before the 点前. This feels a bit tidier to me.
    - but you could also unload it as needed (when you'd close the lid in normal 略盆).
  - Since there's no 拝見, I'd argue that you 棗・ポンポン, then close the lid, keep the 柄杓, take the 蓋置 and 建水 (shifting a bit, if you're so inclined), and get up to leave. This get's slightly awkward if you have a 蓋置 that needs turning.
- 🅱️ You could do it like in 棚:
  - The tray is placed N, then with the 建水 you sit down facing N, too. Then you move the tray (and yourself) to NE.
  - In normal 略盆, now you'd move the 建水, but with the 釜, it is loaded. So unpack it now, then move it.
  - When finishing, you'd first put the 柄杓 on the 建水, then move the tray to N, then leave.