OK, for the 2.0 well the
OK, for the 2.0 well the hydroformed tube was a difficult result to pull off and some imperfections were filled in the first production run. But otherwise it is regular alloy welding. The boom has smooth welding, which is done at a higher temperature. Its easy to pick as it doesn't have ripples. That smoothness is there right off the welding table. Its harder to do, but these guys are extremely good.
For the 1.x the frame has bondo. Not to hide imperfections as the welding quality is again extremely good as you can tell from say the sofrider or quest frames. But to enhance the shape, I wanted to make the frame as nice as I could.