Originally Posted by
McCreed
Not Portuguese, used google! But I took Espanol in high school! (I know they're not the same, but share some similarities).
Just as it says above, this is to temporarily fit the bridge & tailpiece so you can do things like set the neck to correct scale length position; align the neck with the E strings on, etc. before gluing.
The trick with set-neck builds is you only get one chance to get it right (and a limited time for adjustment once glue hits wood) so triple checking everything is important.