I had a problem when i installed thise on my heli. they would not move freely. i pulled the bearing out and there was no coller inbetween the 2 bearings. Not a problem though all u have to do is use the bearings from the old arms and use the coller aswell. if u pull your old plastic one apart you will see.
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1 thumbs up!
I ordered a set too and when i read this review i noticed there was no collar in between the bearings but none the less use the collar from the plastic one and you have unbeatable performance a must for 3D flight