Tutorial: How to make engine part 31

I tried to generate the tutorials long enough for everyone to understand and enough short to won't be boring. please click on it worked buttons, so I can know how many users following the tutorials

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I cant mirror the 2 tubes it tells me geometry pattern results in disjointed bodies
(step 6)

 
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is the start point for the bottom of the sketches in step 8 &11 arbitrary? or does it start on the "top" plane?

 
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