The #6 torx is so fine it looks like standard hex. I have a micro screwdriver set from Home depot with the small torx in it. I recently replaced a clip on a friends Delica, and the screws and replacement screws were #6. If you smash another hex wrench in there ( as he did, incidently ) you will round out the head, and no wrench will work. You will have to get replacements. I don't believe, and call me crazy if you must, that Spyderco would use different size screws for clip attachment from model to model when they are all 3 screw designs.
I ended up using a small pair of channel locks to grab the side of the dome screw head and remove them. The replacements were factory along with the clip. #6 spun them in with blue loc-tite
Have fun stormin' the castle!
-Miracle Max