Lubricant Applicator SM4
The Lubricant Applicator was used to grease door latch bolts on Hubble to make them easier to open. The forked tool device was aligned with the bolt and the astronaut would squeeze the trigger to apply the lubricant.
Image Credit: NASA/Michael Soluri
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https://science.nasa.gov/image-detail/sm4tools-lubricant-applicator-soluri-nasa-2/
Image CreditNASA/Michael Soluri
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