RE: threading 2-56 push rod
no need to silver solder...first off you need a soldering iron big enough to heat both the cleavis and the rod at the same time...use some flux as well...make sure that all corrosion preventive, and oil residue is off the rod before soldering.....once the solder has flowed into the cleavis don't move the cleavis until the solder has hardened....
You can do it