AFAIK `fuseblk` is how NTFS drives look in `mount` output. Hence the suggestion to use `ntfs` option in `fstab`:

    /dev/sda2 /mnt/sg3t ntfs defaults 0 0

If you insist on your `rc.local` solution, you can try to prevent the system from fiddling with your mounts by uninstalling the `udisks2` package. Obviously, don't expect the system to auto-mount anything after you do.

Alternatively, you can keep `udisks2` and use it to mount your disk from `rc.local`:

    udisksctl mount -b /dev/sda2