These adjuster kits use a CNC machined stud which is notched to accept the matching tube.
5/8-18 studs come with standard bushing outer tubes.
3/4-16 studs come with large bushing outer tubes.
Urethane bushings must be ordered separately. Parts included in one adjuster kit: threaded stud, tube, and jam nut.
Please see available options: 3/4-16 adjusters are only available straight, and 5/8-18 adjusters are not available in left hand threads.
I clean the scale off the tube before welding – this will give a cleaner weld and help your tungsten to last longer.