I made the pattern like this: I used a strip of paper which I put around the rim. This gave me the correct circumference. I removed the strip and divided it into 20 equal parts and then put the strip back on the rim and transferred the marks from the paper to the rim.
First I was thinking to use a piece of yarn to do this, but yarn stretches and paper does not.
The bolts I would like to use as nipples are these (I found a couple in my drawer - I will need to buy the other 75 soon enough):
As you can see, the niple standing up already has the M3 thread cut on the inside for the spoke.
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