The first step in the build is the assembly of the rotor head and blade grips. This is a relatively straight forward procedure but requires the use of 5.5mm box spanners to tighten down the feathering spindle nyloc nuts. I didn't have any box spanners and there are no tools supplied in the kit. I actually managed to do this with two pairs of long nose pliers as my box spanners would not fit inside the blade grips. It's important at this stage to know which bushing should go where so I have included below a picture of the feathering spindle outside of a blade grip with the bushings and bearings shown in their correct places. The plastic bushings are the ones that should locate against the dampers in the center of the rotor hub. Care should be taken to make sure that the blade grip bearings are inserted fully into the blade grips, otherwise you won't be able to do up the feathering spindle nuts. I pushed the bearings into place using a large allen key almsot equal in diameter to the blade grip bearings. Parts in the head assembly bag Rotor head and blade grip parts Blade grips Rotor head Rotor head with greased dampener installed Rotor head from another angle Blade grip bearings with plastic bushing Bearings with both bushings in correct places In the bottom pictures above it's important to note that the feathering spindle is beng shown without the blade grip just to show correct location of bushings and bearings. In order to install the blade grips the bearings and metal bushing are pushed down into the blade grip from the blade (not hub) side. The plastic bushing is left on the feathering spindle to locate between the blade grip and the dampener. The series of photos below show the assembly of the blade grips and then the feathering spindle being inserted into the rotor head and the blade grips added and screwed down into place using the nyloc nuts. There is little to get wrong in this step other than the bushings being the wrong way round or the blade grip bearings nor being inserted fully into the blade grips. Blade grip assembly Completed head Back / Next