fsck_ffs not updating standard superblock with alternate superblock

Summary:  FreeBSD 5.0-RELEASE kernel with the UFS2 filesystem.  
Power failure caused computer to reboot,  file systems that 
had soft updates turned on had fsck defer to background fscking when it
was loading, the last drive on my /etc/fstab file didnt have soft
updates turned on, and after it fscked the drive and marked it as clean,
it just hung there.  I booted to single user mode, and commented out
the line for my drive that didnt have soft updates turned on.  When it
rebooted, I manually did an fsck with the alternate superblock because
my standard superblock was corrupted, fsck_ffs never gave me an option
to copy the alternate superblock to the standard one, I tried some dd
commands, but it didnt work.  The drive is good, dmesg showed no errors,
plenty of good superblocks.  If i do get this drive mounted, I'm going
to turn on soft updates for it.

Question:  How can I get an alternate superblock to become the standard
superblock?  Can I mount it using the alternate superblock?

ndb

lunchbox# uname -a
FreeBSD lunchbox.theghet.to 5.0-RELEASE FreeBSD 5.0-RELEASE #0: Sat Feb 15 15:09:53 EST 2003     root_at_lunchbox.theghet.to:/usr/src/sys/i386/compile/THEGHETTO  i386
lunchbox# fsck_ffs -b 0 /dev/ad3s1d
Alternate super block location: 0
** /dev/ad3s1d
Cannot find file system superblock

LOOK FOR ALTERNATE SUPERBLOCKS? [yn] y

USING ALTERNATE SUPERBLOCK AT 32
** Last Mounted on
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
534646 files, 33571978 used, 4883082 free (4298 frags, 609848 blocks, 0.0% fragmentation)

***** FILE SYSTEM MARKED CLEAN *****
lunchbox# newfs -N /dev/ad3s1d
/dev/ad3s1d: 76316.6MB (156296320 sectors) block size 16384, fragment size 2048
        using 416 cylinder groups of 183.69MB, 11756 blks, 23552 inodes.
super-block backups (for fsck -b #) at:
 32, 376224, 752416, 1128608, 1504800, 1880992, 2257184, 2633376,
...
 91790880, 92167072, 92543264, 92919456, 93295648, 93671840, 
lunchbox# fsck_ffs -b 93295648 /dev/ad3s1d
Alternate super block location: 93295648
** /dev/ad3s1d
** Last Mounted on
** Phase 1 - Check Blocks and Sizes
** Phase 2 - Check Pathnames
** Phase 3 - Check Connectivity
** Phase 4 - Check Reference Counts
** Phase 5 - Check Cyl groups
SUMMARY BLK COUNT(S) WRONG IN SUPERBLK
SALVAGE? [yn] y

534646 files, 33571978 used, 4883082 free (4298 frags, 609848 blocks, 0.0% fragmentation)

***** FILE SYSTEM WAS MODIFIED *****
lunchbox# dd if=/dev/ad3s1d bs=16k count=1 skip=32 of=alternatesuperblock
1+0 records in
1+0 records out
16384 bytes transferred in 0.007131 secs (2297542 bytes/sec)



lunchbox# dd if=/dev/ad3s1d bs=16k count=1 of=standardsuperblock
1+0 records in
1+0 records out
16384 bytes transferred in 0.002671 secs (6134025 bytes/sec)
lunchbox# dd if=alternatesuperblock bs=16k count=1 of=/dev/ad3s1d
dd: /dev/ad3s1d: Operation not permitted
1+0 records in
0+0 records out
0 bytes transferred in 0.000541 secs (0 bytes/sec)
lunchbox# 




lunchbox# dd if=/dev/ad3s1d bs=16k count=1 skip=33 of=alternatesuperblock
1+0 records in
1+0 records out
16384 bytes transferred in 0.000973 secs (16838882 bytes/sec)
lunchbox# dd if=/dev/ad3s1d bs=16k count=1 skip=1  of=standardsuperblock
1+0 records in
1+0 records out
16384 bytes transferred in 0.007905 secs (2072611 bytes/sec)
lunchbox# dd if=alternatesuperblock bs=16k count=1 skip=1 of=/dev/ad3s1d
0+0 records in
0+0 records out
0 bytes transferred in 0.000026 secs (0 bytes/sec)
lunchbox#