I would measure rivet head, then drill a divit in a steel bar(that mimics the rivet head) that fits between bench vise jaws to support the rivet head. Then I would use an air hammer(rivet gun) to buck the rivet or you could just use a hammer and large punch. You will need help to hold it in...
It doesn't work that way, with another bolt the headspace may or may not be correct. You may need barrel work. Replacing the bolt knob is easy to do by someone who knows what they are dong. I \t has to be prepped jigged and tig welded with the proper filler rod
buy a se of tools cheap and practice on scrap and you will find a new fortay, its not hard but you have to practice a lot to get your confidence level up there
You should have someone knowledgable look at this before its altered as you may have a collectable rifle and it would be a shame to ruin it. These older classic mausers are getting hard to find and they no longer make them
spread the crack as best you can without it cracking further. Mix small amount of acraglass (not gel) and fill the crack as much as it will take, use a hair dryer to warm the acraglas adding more as necessary, now use clamps to pull it up tight and remove any that oozes out. Leave clamped for a...
I have a new one with extractor and firing pin , it is chinese polytech priced at $55. if Mableton is within driving range. PM me if you are interested.