I'm very careful in how I adjust and lock for that very reason. I'm sure it would be very easy to damage to lock screw if care isn't taken. I'm getting more comfortable with the handling of the goggles during mount and dismount as it were. I'm also wondering if other's use a sweatband with the goggles N3 with flying in summer heat. With the goggles 3 I'm of course not concerned with that because of the material used, but of course just the opposite with the N3 version.