1" diameter solid steel rod (or 1.25" for large doors) that supports the torsion springs. This shaft is attached to the wall with bearing plates. When a chain hoist is used, it is attached to the steel shaft.
1" diameter solid steel rod (or 1.25" for large doors) that supports the torsion springs. This shaft is attached to the wall with bearing plates. When a chain hoist is used, it is attached to the steel shaft.