RE: Two bolts on main shaft.... special steel or not?
I agree...
My question to E-Flight (Horizon) is... why is it that when you purchase spare feathering shafts they come with spare screws and washers but the main shafts do not? My experience tells me that the screws on the feathering shaft "never" fail or bend because they are "captive" in the end of the shaft along the center line. The weak point is where the blade grip meets the rotor head.
As for the main shaft - the torque is transferred through the two "2mm" screws!! The first blade strike and bent shaft saw these bend. This time the top one sheared.
My opinion is that these two screws should be supplied with the shaft - otherwise you have to buy the whole fastener kit...
Jon