Grease. Always grease. The oxidization will weld em in place. I usually disassemble and regrease at least once a week.
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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.
I have a set of 3 aluminium masts + titan foot with JAM 1900 , 630HM, 950 ic6 and 1280 FCT (no titan foot on the 2 last ones). No issues with connections across all disciplines ( kite foil, sup foil, wing foil) I always unbolt everything after each use if more than a week between sessions. To me screws need daily checks. Even after 2 hours of serious riding or pumping I always flip the board for a quick check. Screws thread have to be sprayed with tef gel or corrosion protection like lanolin ( I used natural lanolin since day one).The only 2 screws and threads I did not spray became dry and hard to unbolt and eventually seized during a session ( I had to drill and extract them).