Fixed this side case for a Yamaha Raptor 700 the other day.
Engine cases are matched, so you can't just buy one side and expect it to not leak. Guessing this saved the owner at least few hundred dollars in case halves and more in parts + labor to press new bearings & seals in & at least a week of waiting.
This boss feeds an external oil line that had cracked and was leaking.
I was able to weld it up and retap proper sized threads in it (as just welding up the crack would have yeilded an oversized hole - I had to fill some of it then retap).
This was a bit of a pain since AL absorbs oil to some extent and it all had to be cleaned and burned out before it would weld without massive porosity.
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(My non scientific leak test was feeding a bolt in and then forcing air through a rubber compressed air nozzle on the inside and listening/ feeling for leaks).
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