Allen Head Screws for [HD] & [Mini - HD].
Coupling Screws for [HD] & [Mini - HD] Models. (Secures Swing Arm to Coupling.)
Old Model = (4) 6-32 x 1/2" Screws. (All HD units sold before 3/2/25. All Mini-HD Units.)
New Model = (4) 8-32 x 1/2" Screws (All HD Units sold after 5/12/25. Units sold between 3/2/25 and 5/12/25 could have either screws. Check Color.)