If the new tube can be fabricated I would still consider brazing.
To butt-join two tubes I'd find the next size of tubing and make a sleeve - similar concept to copper sweat-solder coupling, although I would use steel.
If you have to go back to the end block on the pump, I'd carefully bore or ream the block for a very close fit (tap fit, very slight press) and then braze. Tig welding is always a possibility (the demo pieces are out there of aluminum pop cans and gum wrappers tig welded together) but a greater skill level would be required...brazing is going to be a process that's much more forgiving with a thin section in my opinion.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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