Home Ryobi RY401014US 89. Left Knob For Height Adjustment – 538938002 89. Left Knob For Height Adjustment – 538938002$1.54 89. Left Knob For Height Adjustment - 538938002 quantity Add to cart Buy with Add to wishlist Category: Ryobi RY401014US Description Left Knob For Height Adjustment Related products 77. Top Cover Door – 542610001 $4.98 Ryobi RY401014US Add to cart 25. Start Key Assembly $7.56 Ryobi RY401014US Add to cart 49. Plastic: Rear Door for dual (Black) $10.48 Ryobi RY401014US Add to cart 11. Screw 2.6 X 10mm – 660201010 $1.54 Ryobi RY401014US Add to cart