The adjustable screw replaces shimming and can make door hanging a one person job.
1. Predrill window frame/ door jamb (only) with 5/16" drill bit.
2. Engage crown bit into TopStarTM screw head and drive flush to surface of frame or jamb.
3. For adjustments remove crown from bit.
4. Engage bit into center hole of TopStarTM screw head and adjust to your requirements.