I will have to take some pictures next time I go out, but here it is the best way I can describe it.
you should be standing close to the pylon, a foot or two.
Put a bight, or loop (fold rope in half), in the line at the desired length.
You now have a "double line", hold the bight in one hand and let the "double line" fall down to the boat floor.
wrap the bight around the pylon to make a 180 degree turn (U shape), leaving the bight in one hand, and the double line in the other.
the "U" should be open towards you, not away from you.
Take the bight and continue to wrap it around the pylon an additional 90 degrees going UNDER the "double line".
Now the bight should be a 270 degree wrap going under the double line.
Take the bight end, open it up and loop it onto the pylon.
pull it snug and tie up the remaining line and sections.
It works great.
I have ruined the coating of my previous line by using a clove hitch and a girth hitch (aka: larks foot), no good.
If this does not make any sense, let me know and I can take pictures.