Shanghai jian & mei is a pofessional manufacturer of high strength bolts more than 8 years.They are include: Heavy Hex Structural Bolts, Heavy Hex Nuts, F436 Flat Washers, U-Bolts, Weld Stud with Ceramic Ferrule, etc
This Video will show how to adjust just about any closer.
Taken from a 22 minute with way more inro than an installer needs.
so I shortened this one to just thefacts and the closer body and adjustments.
From Terry, Carpenters Local Union Local #156 Oregon City,Oregon