I visited Dean GROBBELAAR at Aerial Concepts in Sandton, South Africa, one of the HobbyShops supporting the 2103 FAI/F3A WC
The place is near the TAMBO International Airport in Johannesburg, address : No 32 Southway , Kelvin, Sandton, 2054
Dean told me that during the Competition, he will be available anytime, and will open the shop even at 2 am if necessary !