Step 16 – Measure 2” from the aft end of the payload tube on each of the lines (the opposite end you did the shear pins earlier). This is where you will drill the rivet pin holes. IMPORTANT: when you seat the altimeter bay inside the payload tube, make sure your altimeter vent holes are not lined up with the rivet lines – turbulence from the rivets can disrupt the airflow over the altimeter vent holes. With the altimeter bay seated properly, drill a single 5/32” hole at one of your 2” marks. IMPORTANT: insert a rivet into this hole before you rotate the tube for the other 2 holes. Last make an alignment mark on the altimeter bay and payload tube so you can remember the orientation since the spacing of the rivets may not be even. Make sure you transfer this mark when you paint the rocket.

I’ve not had the best of luck with plastic rivets in the past. So I decided to go with a stainless steel screw and weld nut. I measured and drilled…

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Placed a few drops of thickened epoxy onto the weld nuts, and some vaseline on the screw to protect the threads…

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And then secured the parts together. I applied thickened epoxy all over the weld nuts.

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I also drilled and tapped for shear pins on the av bay to main body tube joint.

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