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I'm going to lengthen the 1/4 inch diameter shaft by 80mm. It's 11mm long at the moment.
I can use brass coupling, or the 1/4" extention shaft could be welded. How easy is it to weld the extention shaft on, and it be true? There is not much length, shaft only protrudes 11mm. Now if the shaft protruded 6", perhaps you could use angle iron to align the two shafts. Not sure you can do that with only 11mm protruding.
What would you do, just get a brass coupler because it's so much simpler? TIA.