Dont over extend your current one, leaving tiny amounts of seatpost in concentrates the force in that small area at the top near the welds/clamp area, just buy a longer one and use that, 350mm is quite common. That should be enough.
@Pir0 started
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Dont over extend your current one, leaving tiny amounts of seatpost in concentrates the force in that small area at the top near the welds/clamp area, just buy a longer one and use that, 350mm is quite common. That should be enough.