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The shroud was dry fitted down the tube and over the centering ring.
A (longer than needed) 5" launch lug was pushed in from the rear lug hole until it hit the inside of the shroud seam.
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I should say, this is where the first punch will be made. You usually have to go back and make additional adjustment holes with your rotary punch.
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Use the largest tube on your rotary punch which should be 3/16" diameter.
Punch a hole right behind that pencil mark made earlier.
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