OMPHOBBY M4 Helicopter Tail Bellcrank Base(Black)OSHM4031B Sale! from 584 /per Qty. Add to Cart This is a replacement Tail bell crank base for the OMPHOBBY M4 Helicopters Contents Tail Bellcrank Base-1Socket cap screw M2x6-2 Qty available:2 SKU:OSHM4031B