Grease. Always grease. The oxidization will weld em in place. I usually disassemble and regrease at least once a week.
Aluminum or carbon for your mast?
old school carbon
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I have two Fone planes/sets in mono-block carbon. One is slightly used Gravity 2200 with 75cm mast. The other one is brand new Phantom 1080 with 85cm HM carbon mast. What I noticed is when I put the Alu or carbon mast on the Gravity wing then the movement between the wing and mast stopes with very little torquing of the screws. When I put the new Phantom wing on the masts then I need to torque a lot to almost not fill the wing/mast movement. The movement I check by grabbing the fuselage/mast connection gap on both sides of the fuselage and moving the wing up and down. This way you can fill if the gap is changing. I measured the cavity for the mast on the Phantom wing and it is about 0.2-0.3mm shallower than in the Gravity wing. The shallower fuselage base doesn’t allow the sides of the mast foot to sit properly on the sides of the fuselage cavity.
My question is, did you experience that on your sets or maybe I am too picky on that?
I also tried to torque the fuse/ mast connection to 15Nm, that is recommended by Fone but I gave up on it since it is too much torque and you can actually strip the torx screw head cavity with the tool. The 10Nm is already is a lot. Please share your experience in this matter.