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@PhilDAS
I’ve used 3 layers of 3K twill, no idea if that will be sufficient but I’m not too concerned given that the crack is from the seatpost clamp mechanism and the whole of the rest of the top tube to seat tube intersection is undamaged and pretty beefy. As long as the post clamps OK, I think it’ll be perfectly fine to ride.
Worth noting as a disclaimer for anyone else considering similar, as such an amateur, I would never consider this on a repair mid tube, or anywhere where a fail would be catastrophic and possibly cause an accident. And I suggest you don’t try it either.
My possibly wrong assumption is that if this fails, the seatpost slips or drops
Stay safe folks