I have just started using the Hacker 14 XL with 6,7:1 gearbox in my new Elexant F3A plane. The power is fantastic, still I am a bit concerned about the life expectancy of the gearbox. Could anyone show me how, after how many flights, with which lubricants etc to maintain the gearbox, as it is might be the weak link... Pictures would be nice too. Thanks to all.