OMPHOBBY M4 Helicopter Feathering Shaft Damper Spacer OSHM4057 Sale! from 243 /per Qty. Add to Cart This is a replacement feathering shaft damper spacer for the OMPHOBBY M4 Helicopters Contents Feathering Shaft Damper Spacer Φ5*Φ9*0.5-8 Qty available:3 SKU:OSHM4057