This arm is missing oil. No wonder the poor bot can't close it's hand.

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You'll need to FILL the tubes with different amounts.

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Tube 1: 1x Bot Slime. 5x Lubricant. 2x Electro Grease. 1x Heavy Grease. 1x Primer Oil.

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Tube 2: 2/3 Bot Slime. 2x Primer Oil. 1x Heavy Grease. 2x Electro Grease.