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Both align() and find_rotation_center() moved the FZP in and immediately asked the operator to click its centre, but only confirmed OSA was out afterwards (via loptics_out(), which runs after that click). If OSA was left in from a previous scan setup, it would still be in the beam path during the FZP reference click. Add an explicit losa_out() call right before lfzp_in() in both procedures; it's a cheap, skip-if-already-out no-op otherwise. Found while testing find_rotation_center() against the simulated LamNI. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>