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            return null;
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            return null;
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        }
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        }
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    }
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    }
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    /**
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    /**
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     * Calibration nudge, in slider px, sized from the gap rather than fixed.
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     * How close the ring must get to the hole before we release, in px.
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     *
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     *
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     * A fixed 15px was far too small: it closed only ~25px, so the ratio came from a
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     * There is deliberately NO assumed ratio anywhere in this class. px-per-px is derived
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     * measurement ~20% noise and the aim landed ~30px out. A fixed 60px then proved too
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     * from real movement on every attempt and re-derived on every step within it -- see
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     * large in the other direction -- production data showed 85% of attempts with a gap
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     * aim(). Earlier revisions carried an ASSUMED_RATIO constant, it was tuned twice
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     * under 60px ended up UNUSABLE (the piece shot past the hole and the measured gap
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     * (1.7 -> 0.67 -> 1.7) against contaminated measurements, and it never helped. Do not
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     * grew), and 45% overall.
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     *
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     * Aim to close about half the gap: the piece travels roughly ASSUMED_RATIO px per
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     * reintroduce one: the widget's px-per-px genuinely varies by environment (1.4-1.5 in
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     * slider px, so nudge ~= gap / (2 * ratio), clamped. The real ratio is still derived
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     * production, 1.1-1.2 locally) and by brand, which is exactly why it must be measured.
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     * from the measurement; this only sizes the probe.
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     */
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     */
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    private static final double ALIGNED_PX = 2.0;
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    private static final double ALIGNED_PX = 2.0;
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    /**
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    /**
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     * margin-left for logging only. Reading it off a detached element throws, and this is
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     * margin-left for logging only. Reading it off a detached element throws, and this is