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On the left header there was one spot where the primary interfered, so while Aad was welding and polishing I made a little patch plate to weld in the pipe


We closed off the headers with ducktape (wih a little hole) and pumped backing gas in there so the insides of the welds would be nice and even and Aad TIG welded all the connections that we had previously only tack-welded in place.


After that came a lot of grinding and sanding, starting with coarse discs and then finer and finer in preparation for the polishing.


We moved the grinder outside to avoid messing up the workshop and Aad did his polishing magic. One header finished, one more to go!