We've done may many mast splices here so far without issue. Typically we cut out the damaged material so it's square surface meeting square surface and then make up a sleeve out of pieces of used extrusion (we've got a lot of old pieces here there and everywhere) which we cut and weld up until it's as close a fit as is possible then put it in place typically with mechanical fasteners. As I said, we've done a bunch and so far there have been no failures in 20+ years of business so yes it's very doable but making up a sleeve may be tricky depending on the materials, tools, and skills you have available.
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