Just wanted to throw this out there as a follow up to the ACME rod for bushing presses. I completely forgot about McMaster Carr when I was ordering my parts but came across them again recently when looking for some other acme parts for a completely unrelated project(moxon vise.)
I didn't have any issues with the plain steel rod breaking but I am realizing I may have been lucky and although my bushings had a good amount of corrosion they were clearly not seized. I dealt with seized frame bushing on my frontier last year and it was one of the most frustrating things I've ever done(didn't try a press but hours of drilling, cutting and chiseling.) The point of this is McMaster Carr has different grades of steel for their ACME including alloy which is Grade 7 vs Grade 2 and has over double the tensile strength. Hope this helps some of you and definitely regretting not knowing about this option earlier when I was praising my set up, I apologize for that.
McMaster-Carr - https://www.mcmaster.com/rods/acme-lead-screws-and-nuts/