[Samba] migration to new server

[Mark Rutherford]

I need to migrate some 40 workstations over to a new server...
I have googled this for the best part of an hour, and others have had 
this issue and nobody seemed to have an answer.

The old server uses smbpasswd, the new server uses LDAP.
I am trying to write a script that reads the file and sets up these 
accounts on the LDAP server, but
I cannot seem to get the machine accounts to work.

I cannot rejoin 40 workstations, this would be a nightmare.
The only way I can get a workstation to like the new server is to rejoin 
it, despite the fact that
the new server has the same name, SID, etc.
Specifically, I get errors like:

  _net_auth2: creds_server_check failed. Rejecting auth request from 
client HENRY2006 machine account HENRY2006$

What so I need to enter into LDAP to get it to like the workstations?

I have entries such as:
test$:1043:XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:D461D2204D7CECDED9847D069C1E822D:[W          
]:LCT-45B7DA08:

I am using the 4th field here as the sambaNTPassword in LDAP.

Is this correct?
What do I need to do to migrate these machine accounts?