Copy subkeys to primary key

[Ian Hill]

For whatever reason I now have two versions of my private key one
without the ELG encryption key and primary key, the other without the
RSA signing key.

How can I combine them so I have one secret key with both the ELG and
RSA subkeys under the primary key.

This is my new key

sec#  1024D/BE7E87FD 2007-03-14
uid                  ushills (Secure email to ushills.co.uk)
<secure at ushills.co.uk>
uid                  Ian Hill (Work Email) <ian.hill at ayh.co.uk>
uid                  Web Ushills <web at ushills.co.uk>
uid                  Ian Hill <ianjameshill at gmail.com>
uid                  Ian Hill <ian at ushills.co.uk>
uid                  Ian Hill <ian.hill at turntown.co.uk>
ssb   2048R/4436432A 2009-02-06

This is my old key

sec   1024D/BE7E87FD 2007-03-14
uid                  ushills (Secure email to ushills.co.uk)
<secure at ushills.co.uk>
uid                  Web Ushills <web at ushills.co.uk>
uid                  Ian Hill <ian at ushills.co.uk>
ssb   2048g/3173413E 2007-03-14

How do I copy the key 4436432A to my primary key BE7E87FD, as my new key
lacks the primary key and the encryption key 3173413E.

Thanks