Re: Tapped Steam Hole Plug Size Model B block
You are on the right track, a 1/4" set screw may be OK. Only tap part way in so the set screws will jam securely in place, or locktite them. The plugs must be flush on the deck as their purpose is to support the gasket. JB weld works fine and is easy to file flat although sand paper wrapped around a block of wood is better than a file as it won't flex.
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