| Manifolds. Cobalt or Moly-dipped bit makes drilling the holes a cinch. Tapping took a little work (see last pics). Use lots of lube and work it back and forth - forward a bit and then reverse it a bit. (maybe play a little Barry White too). When the going gets tough, switch to a heavy duty handle, or a small crescent wrench. Here are some pics of the spot Woody is talking about. 

MSP against "chinese metal of unknown composition" - LOL 

 
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