Other umount with NTFS-3G

If I mount my extern drive it is no problem. If I umount it following message appears:

Mount is denied because setuid and setgid root ntfs-3g is insecure with the
external FUSE library. Either remove the setuid/setgid bit from the binary
or rebuild NTFS-3G with integrated FUSE support and make it setuid root.
Please see more information at
http://tuxera.com/community/ntfs-3g-faq/#unprivileged

It seems it umount properly, but I am not sure.
The explaination on http://tuxera.com/community/ntfs-3g-faq/#unprivileged helps nothing.
 
Another question. Why can't I mount as normal user?

/etc/devfs.rules:
Code:
[localrules=10]
add path 'da*' mode 0660 group mountusers
add path 'fuse*' mode 0660 group mountusers

/etc/devfs.conf:
Code:
own  da*  root:mountusers
perm  da*  0660
own  fuse*  root:mountusers
perm  fuse*  0660

/etc/rc.conf:
Code:
devfs_system_ruleset="localrules"

ls -al /mnt/extern
Code:
drwxr-xr-x  2 user mountusers ...

ls -al /usr/local/bin/ntfs-3g
Code:
-r-xr-xr-x  1 root  mountusers
same /dev/fuse

/etc/sysctl.conf:
Code:
vfs.usermount=1

Code:
mount_fusefs: /dev/fuse on /mnt/extern: Operation not permitted
fuse: failed to mount file system: No such file or directory
What I have missed?

Also tried with a mount point in my home-directory.

(I am able to mount every other drive with normal user)
 
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