I would guess everybody knows how to attach a block to a mast or spar so this will be old hat to most folks. I thought I’d show the process I use as the tools are a little bit different.
1. Make a figure eight in the line to be tied.
2. Then clamp the ends between a fly-tying vice and a pair of hemostats secured in a vice.
3. Take another piece of line and tie a standard sizing knot around the middle of the lines.
4. I usually do five wraps checking between each wrap to make sure all the wraps are snugged up to each other.
5. Release the vice and insert a block leaving the loop in the jaws and tighten the vice.
6. Slide the knot down the line and push it tight to the block.
7. Take the assembly from the vice and hemostats and place the other loop on the mast or spar and pulling the other tag end close the loop over the mast.
8. Apply a small drop of CA to the knot and trim the tags. I use a small pair of fly-tying scissors that are great for getting close to the knot.
9. Trimmed and secured to the mast.
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