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Sometimes I just sit and think. Other times I just sit.
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This Kiwi company makes solid fibreglass rod including 3mm.
https://www.gracolcomposites.co.nz/pultruded-fibreglass-products
Sometimes I just sit and think. Other times I just sit.
Marine chandlery should stock "gripper clips" made in 3mm diameter 316. Length of the folded clip on a site I looked at was 68mm, so allowing for a bit of loss from cutting etc, you'd be able to cut 5 x 10mm lengths from the straight shank of one clip (about $7).
I'm guessing that the ends are going to have to be rounded off and smooth after cutting, so they don't chafe the batten pockets in the sail, so use a drill and file, then some polishing with some wet and dry paper should do the trick.
Edit: was just in the workshop and looked at some pop rivets, all the 4.8mm SS ones I have (different lengths), the mandrel measures exactly 3mm. So you'd probably be able to cut 4 or 5 pins from one pop rivet mandel. The mandrels on SS blind rivets are stainless - you can tap them out from the rivets fairly easily.
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