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If there are gaps left in the shield cone, fill them in with a second, thin layer of epoxy.
For cap: attach optical ferrule cap (different depending on EIB type) to cap. This securely holds the cap in place and allows easy removal and re-attachment.
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Guide the ground wire through the bottom opening of the protective schield shield cone and attach cone with epoxy. Make sure there is a strong bridge of epoxy between the side of the drive body and the cone. Use multiple layers of epoxy if needed. Take extra care not to touch and bend electrodes with the protruding end of the ground wire.
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If corrosion is a concern in your application (especially for long recording durations), also add a light oil film along the arms of the springs. This will lead to much more dust/hair buildup inside the drive, but will reduce corrosion.
At this point the electrodes can be lowered somewhat and gold-plated if desired. After gold-plating and impedance measurement, the gold pins should be secured to the eib with a thin layer of 5-minute epoxy. When re-using the EIB for another drive later, this epoxy can be removed easily by leaving the EIB in ethanol for a few days. This softens the epoxy so it can be easily removed. Also make sure to remove the epoxy from the omnetics connector(s), also under the solder feet, and re-epoxy the connector.
The drive is now ready to implant.