I would use a Permatex type silicone adhesive/sealant. Apply a thin layer,clamp it together. Only way I can ever get the 2 pieces apart is with heat....blow torch style. I tried blowing the block apart with water pressure,prying it,ect and couldn't loosen the 2 sides.
Permatex may also help with any galvanic corrosion as the 2 dissimiliar metals won't actually be touching.
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