This jack screw works with the jam nut and the angled Hemi idler bracket to keep tension against the idler pulley T-nut to stop idler pulley from slipping and the loss of a run due to blower belt failure.
It is machined from billet heat treated steel using 3/8-24 threads with a 12 pt. nut tig welded to the top to allow the user an easy way to tighten or loosen.
This jack screw is made from billet steel and is heat treated to grade 8 specs. for longevity.