T8 fill the gap at the solderposts?

[Stoomstrijkijze]

Hi guys,

I recieved a 1900kv T8 for my buggy this week. I saw there's a gap at the solderposts and I'm a bit worried about it. Should I close the gap with something? We race on astroturf and there's a bit sand on it (beachsand) to make the grip less. I'm worried about the sand getting into the motor and do damage to the motor/rotor/bearings.