While you are worrying about the threaded rod have a wider look.
If the sliders on the front idler are worn this lets the idler move up and down more than it ought. Which flexes the idler adjuster and things further back.
Which can break either the threaded rod OR the two bolts that hold the recoil spring assembly together. And on the way likely will work the bolts holding the front casting of that assembly (where the front support for the BE blade bolts on) to the track frame loose.
The bloke who repaired our adjuster drilled the front flange, necked down the threaded rod to suit and silver soldered it.