Instruction:
-Suitable for M690L.
-Brand new lower main frame upgrade for M690L with retract moving 45mm forward to prevent against body dip to the front.
-Enlarge the retract width to 71mm while the original width is 56mm only. It allow a bigger capacity battery to be used for M690L, such as 6S 22.2 16000mAh.
-The newly essential M690 auxiliary battery plate with solid hook allow a steady fix for large battery.
-M690L with new upgrade main frame can also perfectly fit in M690 carry box.

Specification:
-M480 Lower Fiberglass Plate x 1
-M690 Auxiliary Battery Plate x 1
-M470 Frame Mounting Bolt x 4(M2.5x28mm)
-Socket Screw - Nylok x 14(M2.5x6mm)
-Socket Screw - Nylok x 8(M2.5x10mm)
-Socket Collar Screw - Nylok x 2(M3x8mm)
-Flat Head Socket Cap Screw - Nylok x 4(M2.5x6mm)
-Washer x 8(Φ2.5xΦ7x1mm)