Bottom Bracket Alignment

I have a press fit kit and installed a bb successfully - but had a job aligning the plastic shell. Most videos I've watched seem to just assume everything is lined up ok so that when the press kit is used the plastic inner shell meets 100% with the two bearing fittings. Is there a technique or something else (plastic sleeve) that is used to ensure that when tightening the two shells together the inner plastic sleeve is fully aligned/mated?

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