The Spring Yoke Sleeve is made of plastic and are placed on the #3 and #4 Shafts of the Yoke assembly where the 070002689 LH and 070002688 RH Tension Springs are located.The sleeves prevent the springs from wearing into the shafts.Early 82-70 Yokes only have one RH and one LH Tension Spring. When rebuilding the yoke assembly add a second RH Tension Spring to the #3 Shaft for smoother spotting cup movement.Compatible with: XLi EDGE, 90 XLi, 8290 - 90 XL, 8800, 8270