The gunsmith might be the way to go. I am looking at the photo and did a net search- it is interesting in the respect that I am unfamiliar with how the safety works however there seems to be several adjustment screws. On other firearms you can adjust things such as the trigger not over traveling beyond the fire position. I am wondering if someone was playing with some of those adjustment screws and got the thing so that it isn't functioning. Trouble is....I'm not sure there are that many gunsmiths around that may know how to adjust that mechanism- you might be better off just looking on the internet for what information you need. Maybe an old owner's manual might be found. There are a lot of BAD gunsmiths out there- guys that might adjust a standard Remington 700 trigger or put on a scope- lap the rings, stuff like that- but really don't know much else. I had a low hammer problem on a double side by side shotgun and took it to two local gunsmiths that didn't know how it was malfunctioning, one said "the guns were made that way" another said "weak main springs" and both were WRONG, worn nose sear and notch were moving the hammer forward- hence "Low" hammer- a double that was misfiring on occasion and the action springing back a little when opened. The fix- new sears EASY and a five minute job.
So...be careful in selecting the right gunsmith.
There is also a group- American Gunsmith Association- something like that, Palm Coast Florida if I recall- I belonged to it for a couple of years. They put out a monthly magazine with usually two or three firearms featured. They may have an old issue that deals with the safety mechanism on the your rifle. Keep on keeping on for now.