You can easily buy the motors for a fraction of the price of purchasing the entire arm.
When ordering the Motor make sure to get the correct one they two types one is Clockwise, and the other is Counter Clockwise. You can tell the direction of revolution by looking a the propellers.
The motor can be purchased on eBay for a very reasonable price. For example here is one listing on eBay but it's coming from China [ Ссылка ]
Try to see if you can find one locally so that you can get it faster.
![](https://s2.save4k.ru/pic/errQ4B3Doo0/maxresdefault.jpg)