Not Ranked
The holes could be countersunk and threaded. If the shield was of thin material the thickness of the screw head would be thicker than the material thickness of the shield. Basicly the c'snk part of the screw sticks through the shield hence the need for extra relief on the manifold for the screw to tighten the shield down.
Just a thought, I could be wrong and probably am.
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Terry
"I may be paranoid, but that doesn't mean they are not watching me"
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