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Research on the strings for tops didn't yield much. All I found is that the length of the string matters. It said 60" was a good length but did not specify the thickness of the string. I have a spool of nylon sash cord for blinds and started out using it. It is made of nylon and I found it may be too slippery. I got the tops working well with it after some practice but thought the kids may not have the ability or patience for that . I went looking for some type of cotton cord but didn't find anything local thick enough. I did find balls of natural cord at Hobby Lobby that looked good but not thick enough either. I bought it anyway with the thought I may be able to spin two strands together using the same technique I used for the Yo-Yos. Gave it a shot and it worked well with a cord .140" thick. The sash cord was .100 inches thick. After the first cord was made I knew I had a winner. The tops worked easier and I attribute that not only to the thicker cord but to the fact that the cord ended up closer to the outside diameter of the top which theoretically would get the top spinning easier right off the bat when thrown. So here is how I made them. I cut a 152" length of the cord shown and tied a knot in each end. The cord is three strands and I took large paper clips and hooked a strand on each end. I hooked one end on a stationary hook and the other end on a hook inserted in my drill. I twisted the cord running the drill in forward/clockwise motion until the length shortened up 24". While spinning it with the drill I kept moderate pressure on it holding back on the drill enough to keep the slack and whip out of the cord. Once it is 24" shorter there is plenty of twist and will knot up with the speed of light if constant tension is not held on it. Now the drill end has to be removed from the drill and put on the stationary hook with the other end. The drill hook has to be holding the half way mark as you do this. My arms are long enough that I could hook the string with the drill and move the end without it knotting. It would have been easier with a second person but I found it doable. Now that the cord is hooked halfway the drill has to be switched into reverse and spun in a counterclockwise direction. For some reason the cord gets longer as it is reverse spun and after spinning it for a while it will start to shorten up again. When this happens the top string is done. Put a knot big enough in one end to catch the string when winding and a finger loop or a button for the back of the fingers which ever you prefer. Oddly enough the string wound the way it is pictured above at the suggested 60" and the tops spin well. How about two at a time?
