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Just thinking out loud - how about soldering a thin flat piece of brass between the underside of the rectangular (square) and round bit ? - so you offset the round piece just enough to clear the socket wrench ....I can only concur that this model is getting better and better
That looks quite a complicated soldering job I do like your powder coating finish
Nice that you could solve the problem with a smaller socket I'm a lot more of a soft solder expert and just about nothing with regards to hard solder - so caution needed here - but solder tends to flow towards the hottest part ....So I wonder if the part where you can't get it to flow, is slightly cooler than the other side where you got plenty ...?Careful - you do NOT want to keep the flame fixed at the same spot - but keep it moving all the time. Done correctly, you can move the solder with the tip of the flame.Not having the area that needs to be soldered clean enough can prevent the solder from flowing there ....Now one last question - do you have water or exhaust gas where you do not have a perfect flow ?In case of gas - you probably do not have a problem here .... water might result in a slow seepage ....