If you don't have .050" thin cardstock centering rings,
You can lighten the engine mount a bit by "halving" 5/20 or 20/50 rings.
On the left is a 5/20 thick centering ring.
Start by drawing a pencil line around the outside of the ring.
Using a fine razor saw,
Carefully cut around the ring following the pencil line.
Clean up the rough sawn face using 220 grit on a block.
Here's a single ring, split in two.
Maybe not as light as flat white cardstock rings, but still a reduction of weight in the tail end of the rocket.
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