Bob,The line I used for the rigging is 2 lb .005"/.13mm. I picked up 1lb also, which should work better with the buckles. The 1lb. has a nominal thickness of .004/.10mm. doesnt' sound like much, but I tried it on the tail rigging on this one and it is noticably thinner. I was concerned about tying a knot with the heavier 2lb line. I would still like to try the invisible thread too. Just to keep the options open. My eyesight isn't what it was in my younger daze,lol. I like the idea of using the buckles and will on my next build. I had a line pull loose on this one, and had a heck of time refastening it without damage to the finish. The buckles would make finishing and repairs(if needed) alot simpler, IMO.