Smooth and round up the edges using a sanding block.
In the picture, the edge on the right side has been smoothed over, the left side has not.
One of the centering rings is used for a shoulder and support. I did sand the edge of the ring a bit to get it to fit under the vacuform disk edge.
For a reference point when gluing, pencil tick marks were made where I found the best fit of the ring and the overhanging lip of the disk.
The instructions suggest using CA quite a bit. I've had experience with CA becoming brittle with time and pieces have separated at launch! CA (Super glue) has it's place but not on a rocket you want to keep longer than a few years. I'll use it to fill mold marks on a nose cone, but not on fins, launch lugs or nose cone connections.
I've really got to buy a new bottle of contact cement! This one is over 10 years old and has browned up quite a bit.Brush contact cement on both surfaces and allow to dry thoroughly.
Contact cement give an instant bond when two pieces are joined!
Be ready, it grabs fast and won't let go.
Be sure your placement is right before pressing the two glued pieces together.
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