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The quartet of heavy weights were lifted into the air by cranes aboard the Port of London Authority (PLA) vessel London Titan, to allow for the chains they are suspended from to be renewed.
Supervising the operation aboard London Titan was PLA skipper Keith Reynolds.
Keith said: “We were pleased to be able to help the RNLI out with this important piece of maintenance on their asset.
“Lifting each of the weights out individually took quite some time, but the operation went very smoothly.”
RNLI Gravesend’s Alan Carr said: ‘It is important Gravesend lifeboat is ready to launch at a moment’s notice, so having the pontoon working perfectly is really important in saving lives on this part of the Thames.
“We’re glad to see our four ‘angels’ will be keeping watch over us for some time to come!”