Namabiiru!
I hope the pictures are self-explanatory. The blocks I am stropping are 3mm. I also did several 2.5mm tonight. For the 3.5mm clew and sheet blocks on the lower yard I went around with the thread twice.
First 2 pics are materials and tools - I use a cheap thin brush to paint the medium onto the block and thread. This thread is 100% cotton. In my Lovely Renee I used CA and then learned that I should not have used CA

I think I'm right that CA and ploy thread can be used together so you can experiment with that combo.
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This is 3mm block. The eyebolt is about .8mm outside diameter.
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Don't paint the medium on the block until you have the thread in place. I tried it the other way and it didn't work for me. Maybe the missing fingers? I don't know.
Hard to make my camera focus on small things and hold the small things. One side at a time. Paint the medium on top and blow on it and count ten seconds. Then do next side. Don't rush it - maybe 15 seconds. You can see I have the thread I'm fixing through the tweezer void and I'm holding both threads with tension to hold the eyebolt in position while the medium dries enough for me to tilt the tweezers send the opposing thread through the void paint and pull against both threads wile the medium sets up.
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Once your commfortable that the medium is holding, reverse the block bottom side up and paint some medium here and on the threads if you are only going around once. If twice, paint some medium here, blow and count . . . then push the thread ends to their opposite sides underneath the block through the tweezer void and paint both sides and count and pull on the threads to snug them down.
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Handy dandy cuticle clippers for clipping the excess thread once the medium is dry.
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I hope that was helpful.
Blessings.
Chuck