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I have a question about the vented leash plug: Is it essential to add Cab-O-Sil to the resin ?

No it is not 100% necessary to use Cab-o-sil in the vented leash plug installation. 

The cab-o-sil thickens the resin so it does not drain into the foam as much, using less resin and eliminates the possibility of having to fill the plug hole twice with resin.