The S-IV Ullage Motors are angled at 30 degrees.
You should sand the end of a dowel to 30 degrees before cutting it to the 1/8" length.
I printed an online protractor. You can find one HERE
The dowel was set parallel to the bottom of the protractor base line on the print.
My sanding block was set to 30 degrees on the protractor.
Both were held at this angle and lifted from the protractor.
The angle was sanded by moving the sanding block back and forth against the steady, held dowel.
The angled dowel was cut to a 1/8" length.
Be ready and hold both ends down while cutting.
When the first piece of 1/8" dowel was cut free, it flew across the room!
The lower end of the 1 1/4" pieces of LH2 continuation ducting have to match the angle of the fairing.
This is simply a trial and error process. Sand, then check the fit.
In the picture at the left, I still had to change the angle by sanding a little off the tip side to get the proper fit.
After you get the angle right, then round the top.
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