Install Drywall Ceilings The T-JAK Cabinet, Drywall Jack, model TJ-104 D gives the T-JAKA(R) an added dimension. It is used to support the plasterboard, drywall that is being installed on the ceiling. The Drywall Tool includes a T-JAK, a two foot extension shaft and a pair of drywall support brackets. This tool also handles many difficult overhead tasks. Support Crown MoldingWith a block of wood fastened to the TJ-104 D top plate and raised to ceiling to be a ledge to hold up the far end of the molding while the installer is fitting and/or nailing the other end. Support Ceiling Fixtures Hold up larger ceiling light fixtures and track lighting with the (TJ-104 D) Install HVAC rectangular ductwork Support ductwork up against the floor joists. (TJ-104 D)