# Removing/Reinstalling the Herelink Cover

{% hint style="warning" %}
Improper installation of this seal can allow water entry to the Herelink Air Unit, which has little internal water resistance. Failure of the Herelink Air Unit would result in a loss of radio link. Repair of this unit requires the entire Astro to be sent to Freefly.
{% endhint %}

### Removing the Herelink Cover

Invert Astro. Remove 3x M2.5 x 5 BHCS and remove Herelink Cover  with Seal from the Astro Chassis underside.

![M2.5 x 5 BHCS locations](/files/LnzKRHhYgjCsLDa0Q0XD)

### Reinstalling the Herelink Cover

1. Install Rubber Grommet

![Start the grommet 3-4 mm past the bottom of the Herelink grommet](/files/jkd4YaiBDa2q0koZ1zea)

<figure><img src="https://files.gitbook.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F8dwrGJhxGd9cIvsStziq%2Fuploads%2F26DtHWeTn8BDRQAoyr3y%2Fimage.png?alt=media&#x26;token=247488ca-b52c-4a74-b7da-0ab24bd8b352" alt=""><figcaption><p>​Push the grommet onto the lip on the inside of the Herelink Cover​</p></figcaption></figure>

<figure><img src="https://files.gitbook.com/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F8dwrGJhxGd9cIvsStziq%2Fuploads%2FbVJ2So6KP6pM5DvsPN5l%2Fimage.png?alt=media&#x26;token=fd84f28e-728e-45ae-85d5-7db63e7a0c8a" alt=""><figcaption><p>Ensure the Seal is fully seated and pushed into the corners of the Herelink Cover. The grommet should fit snuggly into the corners of the herelink cover, and there should be a small amount of extra grommet on either end.</p></figcaption></figure>

2\. Use 3x M2.5 x 5 BHCS to mount Herelink Cover to Astro Chassis underside. Apply Loctite 222 to fasteners. Torque to 0.2 newton meters (finger tight).

![Make sure all of the cables exiting from the Herelink are being covered and none are pinched.](/files/Pzk9ZQZD3zPtQ2r0GkhZ)

![Ensure the Herelink grommet's two tails are tucked back onto themselves and that the grommet fits well along its whole length.](/files/sGrteDz7WpC9o2CTHwbv)


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