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I have a question concerning magic items. If I take a pattern Item, and then enchant it, would the thread rank woven to it count towards using it like a pattern item , or do I need to weave an entirely separate thread to use it in the manner of a pattern item?

I'll give an example of what I thinking of:
Let's say that Flametooth, the threaded dwarven sword also happens to be a pattern item for the dwarven weaponsmith Targus (it being his first crafted blade, which he carried through many adventures, and eventually enchanted himself, before losing it in an airship battle). Could a player find the blade in a field, weave some threads to it to unlock the flaming weapon properties, and ALSO use the same rank of thread to add a bonus to all tests against Tagrus himself (who is now intent of getting his beloved blade back)?

Turning a pattern item into a Thread Item basically Re-Names it (the Pattern undergoes massive shifts). This severs any previous threads attached, and the explicit connection to the master pattern which previously made it a pattern item. So this doesn't ever happen, in RAW. Usually, the pattern item will manifest alongside the well-used thread item (the scabbard/belt/sharpening stone/a gem on the scabbard/etc). I think the only exception(ish) is the Weaponsmith's Heartblade (it retains it's pattern item status, but gains powers, if I remember correctly).

Yeah.
The setting background is: An item can only ever be a pattern item for one pattern. Threaded items are pattern items for themselves, so they can't be pattern items for a person.

There's some advice and a sidebar on bringing the two together at the end of the item design rules in the GM Companion, but it mainly goes one way: you got a pattern item, and at some point, it turns into a legendary item incorporating the legend of the character. It looses its pattern item function at that point, however.