That is one way of doing it. The tubes, as already stated, are pressed in, in addition to being plug welded. I've done it and it is a "job" I drilled the plug welds (rosette welds) out by starting with a small pilot drill, about an eighth inch or so then working my way up to a drill large enough to remove all the weld. Takes a large press, plus on the D60's I did, several machined plates or plugs to fit inside the tube, to press them out.
Probably an easier way for someone without access to machinery to do the shortening job is to grind the weld off/out that hold the inner knuckles on. You can "pound" the knuckles off, cut the tube to the needed length, and then reweld the knuckles back on, having rotated them to where you want them.
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