Tightening spreads in LME nickel and renewed upside vigor in the base metals complex is likely to push the metal higher once more even if volumes remain relatively modest, a London broker says. "A crack at the $50,000-metric ton level looks quite possible, although I'm not sure I'd have the nerve to be long at this altitude," he adds. LME nickel is last at $48,400/ton, +5% from Tuesday's low.