The Yokomo ZC-A3660B is an aluminum spacer designed for RC-scale use, offering thicker single-piece shims instead of stacked thin washers. The single-piece construction increases mechanical strength and positional accuracy compared with stacking multiple thin shims, which helps maintain consistent spacing under load and during adjustments.
There are three thickness options included in the range, covering 4mm, 5mm and 6mm sizes, each pack contains 8 pcs. These spacers are intended for small, repeatable changes to component spacing such as gearmesh shims, suspension pick-up spacing and axle or hub offsets on 1/10 touring and drift platforms. Installation simply replaces stacked washers or multiple thin shims with a single thicker spacer at the same mounting point.
When tuning, choose the thickness that achieves the required clearance or preload, and verify alignment after tightening to ensure no preload shift. As an aluminum accessory, these spacers are best used where improved rigidity and repeatability are needed compared with paper or multiple thin metal shims.
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