I am trying to “add” an entry to grub.conf on CentOS 6.3 – and change the default=0 to default=1

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,0)
# kernel /boot/vmlinuz-version ro root=/dev/sda1
# initrd /boot/initrd-[generic-]version.img
#boot=/dev/sda default=1
timeout=5
splashimage=(hd0,0)/boot/grub/splash.xpm.gz hiddenmenu title CentOS (2.6.32-279.el6.x86_64)
root (hd0,0)
kernel /boot/vmlinuz-2.6.32-279.el6.x86_64 ro root=UUID 337d96-de39-43f1-99c2-8a6a1fadd465 rd_NO_LUKS rd_NO_LVM
LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=auto KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet
initrd /boot/initramfs-2.6.32-279.el6.x86_64.img title Boot Other
root (hd0,0)
kernel /boot/vmlinuz
initrd /boot/initrd

I then run “grub-install /dev/sda” and reboot. If I cursor down – my new title is present – but the default is still the first title.

What did I miss ?
Thanks,

jerry