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Looks like the teflon disc that laser sailors put down the mast well.
I dont believe that 'remains of a plastic disk' in the photo is a part of the RS Aero and it is not required. I wonder if it is something that has fallen accidently into your mast pot and then worn.
The RS Aero mast pots have a small drain hole in the bottom to allow grit to escape.
The base of the mast pot is stainless steel to avoid wear, no disk insert is required.
The plastic base of the mast has indents to help avoid larger grit from causing damage and wear.
Additionaly, the mast pot is presicely located into the hull mould, ensuring all RS Aero mast rakes are identical.
My boat gets probably more than its share of sand in the mast step. I rinse it out as offen as I can. (Sorry I don't have video of my lee shore beach landing in 18 kts.) Today, along with the sand, out came the remains of a plastic disk. I assume this played the same role as the mest step bearing on a Hobie Cat. But I've never seen them in parts lists, etc.
Suggestions for my repair, etc. By the way, I'm just an over the hill day sailor so rules compliance is not essential.
ps. 2776 Name "Fool's Gold" because of all the iron pyrite in our sand.
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