Don't punch out the centering rings.
Use your knife to cut through the hold down tics.
You might have to cut from both sides to free the rings.
I always thought this was a smart idea.
Use the nose cone to rub down the cutting burrs on the Part D green spacer ring.
I also sanded the inside edges of the white centering rings to get them to slide over the engine mount tube.
The lower ring (the mount is flipped over) is spaced using the green spacer. I use my sanding block to press it even with the end of the motor tube.
Don't glue the green ring to the tube!
Remove the green ring after the other side of the white centering ring is glued on.
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