Applicable for modifying and upgrading 550/600 helicopter model. Add thread observation hole, suitable for Φ2.5mm thread rod. Various colors of ball link can meet your demand. Structural design can effectively improve flight stability, satisfy flight load requirement.
Caution:
1.Thread rod installed, effect depth should be greater than 1.5 times the diameter.
2.Linkage ball and ball link need to be installed with zero tolerance. And confirm it can turn smoothly. Can use reamer or WD40 lubricant.
