Re: Threaded rod? Bolts?studs?
The argument against using bolts instead of studs has merit, if, you do a lot of assembly and disassenbly. I try like heck to get things right the first time and seldom have to worry about taking things apart multiple times. I've used Allern head cap screws for intake and exhaust manifolds, engine mounts and in other areas and have accrued thousands of miles on my bikes with no damage to case threads or fastener failure.
Like almost every aspect of motorized bicycle building you have to decide what works for you. Replacing studs with bolts works for me. You'll need to decide if that suggestion is right for you.
Age and Treachery Will Always Triumph
Over Youth and Skill & "Charlie Don't Ride"