How to change the UniqueID of the primary user account?

A friend brought to me a MacBook Pro he'd just bought so I can set it up for him. The primary (only) user on it was named User, and he didn't know the password. I reset the password using Terminal from the Recovery partition. Then I changed the account name to his name, and followed these instructions to change the account shortname to match his name, then deleted the original (now empty) account, so there's now just one user account on the computer.
Then I checked with Terminal (after hunting on the Web for the proper command; I used the simplest I found, and it worked), and found that the account now has the UniqueID number 502. Practically speaking I guess that doesn't matter (I have yet to delve into the depths of permissions &c), but as a neatness freak I'd like the account to be numbered 501, just as if it were the original account created when the computer was first set up.
A Web search found a couple of articles by Unix experts offering several different methods, all seeming rather complex, and disagreeing on which is best, and whether to use root or sudo.
Can anybody describe a simple way in OS X to change the number of the account from 502 to 501, without causing any harm?

HandyMac wrote:
ClamXav didn't find anything but a couple of suspicious attachments to old emails.
Sure, but ClamXav (and most all A-V scanners) don't look for key loggers or spyware since most of it is commercial software installed on purpose by parents or others who hopefully have a legitimate reason for doing so. Only MacScan from SecureMac specializes in that sort of thing and it's not very good at detecting anything else at the present time.

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