Torsion bar adjusters sticking way out of control arm?

HELLO, I know this is a dead thread, But.. When I was a kid, the Thread Cleaning Chasing Taps and Thread Files were Common. Can You provide me a place to get the cleaning taps?
Also, 1 quick Question, can OLD t-bars settle as much as 1 or 2 inches just while sitting for a while?

Amazon product ASIN B01HYU0RYM
I don’t know how long the that is but I know A-bodies with Hemi with .87 t-bars that haven’t settled in 10+ years