Ben,
sometime just the right piece of tubing is available. Most times we buy a piece of the same size but double the wall thickness, and turn it down on the lathe to fit inside perfectly. We achieve a seriously tight fit this way, and then we 'rosebud' weld throughout the splice area and butt weld the seam.
keel stepping would be the way to go, imo
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Brian Duff
BVI Yacht Sales, Tortola
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