Here are the correct dimensions:
2.25" OD
0.065" wall thickness (so I think 16 gauge?)
122.25" length, plus or minus 1/4". This is the only mast dimension in the Sunfish class rules. If you don't care about ever racing with that mast, then roughly 122.5", but no less than 122".
Use 6063 anodized aluminum. Definitely make sure it's anodized. Ask me how I learned that.
