[Equipment] GB thrusters are not sold anywhere.

[Sally]

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Type: Equipment.
Bug: There's no sellpoint for Gunboat thrusters, they don't even show in FLStat.
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I suggest just adding a sell entry on New Haven for now until they can be added to all bases where it would make sense.

[Haste]

They cannot have salepoints as every GB starts with them on purchase and they cannot be lost. 0 price items -- which are needed for FixedMounts to work -- will crash the game if they have salepoints. Not a bug. The only "bug" here is that there can be (and likely are) old ships without these thrusters, which have to be fixed individually.

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