What are my options to fix a broken banjo bolt that connects the block to the water pump through the U shaped steel line. The banjo bolt on the block side was welded. On 1/2 turn with little resistance and it sheered off. I ended up drilling it out in hopes of getting back to the threads but that thing was welded through and through. Now I have a bigger hole and a specialty bolt that has to be there, or does it? Can I plug it? Can I tap it with a bigger diameter thread and drill my own specialty banjo bolt? What can I do? Thanks

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1981 240D auto
1977 240D manual 300 Turbo swap
1983 300SD
1983 300TD Parts car