The inter stage can assembly is glued in place in Step 3.
The instructions have you cut four square panels from the bottom side of this assembly. I decided to use my hole punch again.
Here I'm marking the inter stage can using a standard fin marking guide.
This is where I made a small mistake. I marked and punched three holes like on the T-20 tube in the last step. The instructions do tell you to cut four 1/4" panels in the larger interstage can.
I don't think it'll make a big difference in the staging, I'm just warning the builder to be aware of the difference.
As before, my hole punch was used to make the vents.
I applied a coating of white glue to the inside of the vent holes for strength and protection from the engine staging.
This glue was smoothed out with a finger.
The area of four 1/4" x 1/4" panels is equal to five 1/4" diameter holes. Punching six round holes 60° apart would be a little more area, but probably a safer fix to this problem.
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