Suggestion to fix Impact M3 Leak

I've identified a leak coming out of the screw identified on the FX M3 schematic as D70 - Dog point grub screw M3x5. I don't see a rubber seal in the schematic so it appears to be just the screw sealing the hole. I've tried tightening it down but it is still is leaking. I don't want to tighten it too much and strip the 1.5mm socket head.
Anyone have a solution on how to stop the leak?
Thanks

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