You have to be careful with the locktight, the T6 screw that you have to unscrew strips so easily, its crazy, personally I wouldn't use any locktight at all.
If you want I can send you copies of a few hundred e-mails that show that the metal straps on Suunto D6's as well as the D9's are very prone to unexpected breakage as well as the elastomer ones are.
No warning, they just fall off.
If you want to see just how to change the strap, take a look here:
Installing the Suunto D6 - Tibby-Adapters and Straps for your Suunto Dive Computers and watches
Cheers
Duke