I will be there on Thursday and Friday AM only.
Just this morning I re-attached a forend loop to a set of Titanic barrels that had pulled free.
Everything else around it was good and tight. It was done without compromising the surrounding ribs and no re-bluing was needed. See below a photo of the finished repair.
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Granted there is always a chance for some discoloration when doing work like this, but usually with some care the job will come out satisfactory without having to do anything like that.