Body
Most modern yo-yos are made from a "take-apart" design, designed to be taken easily apart and reassembled by the player. This design was first created by Tom Kuhn. This enables the replacement of yo-yo components, including the string, renewable friction sources, or even trans-axle components.
In order to increase spin times, extra weight was added to the outermost portion of the yo-yo. The first to do this was Dale Oliver (Spintastics Skill Toys, Inc) with the addition of steel rings when he brought out the Tigershark yo-yo early in 1998.
Some take-apart designs allow the player to reconfigure the yo-yo's halves. In the Tom Kuhn No Jive 3-In-1, the halves may be attached in three different configurations, resulting in a traditional, butterfly, or "pagoda" silhouette. In the Yo-yo Factory FlyMaster, the body has two different "shells" to convert to and from an off-string yo-yo.
Another innovation to the yo-yo is the ability to adjust the gap between the two halves of the yo-yo, in order to increase or decrease response. In most designs, this is accomplished by twisting the yo-yo halves, but some designs (such as the Tom Kuhn Silver Bullet) can be disassembled for adjustment without twisting. This second option eliminates the possibility of the yo-yo coming out of adjustment during play.
- John Jerome McAvoy, Jr. was awarded patents for the gap-adjustable yo-yo: patent #5389029 on February 14, 1995, and #6066024 on May 23, 2000.
- In 1998, HSPIN launched the Handquake series of yo-yos, which sported an adjustable gap by using shims of 0.1-0.5mm thickness. By adding or removing shims, the gap could be widened or shrunk by +/- 1mm.
- Harry Baier (creator of the "Mondial" yo-yo) and the Flambeau Products Company (owner of Duncan) were awarded patent #6162109 on December 19, 2000 for a gap-adjustable yo-yo which has discrete positions for specific gap widths. This patent was first implemented in the CameYo Mondial before being bought by Duncan.
- YoYoFactory's productline of Speed Dial yo-yo's feature "Fully Adjustable Starburst Technology" which allow the gap to be adjusted using a dial on the yo-yo. This allows for a more discrete response setting that stays the same after the yo-yo is taken apart and put back together.
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