The 2.5mm is for the motor screws looking at the manual, (well i hope it is)
regarding
Pinions what are you guys useing in the B4.1 with a 6.5
NUT DRIVER something to add, do you know what size i'm going to need as cant see it in the manual,
Back when i was racing the english summer was not always the best, lets hope that has changed but if not a Gazeebo will be needed..