Found the arm to be a very tight fit on the square drive shaft one of the units but the other two were ok.
Eclipse door closer fitting instructions.
To adjust a door closer you will first need to locate the appropriate hydraulic valve by consulting the instructions or specifications.
Power adjusting valve must face away from hinge side of door.
Eclipse 28989 adjustable size 2 4 overhead silver door closer.
Drill pilot holes in door and frame according to template.
Fitted and adjusted quickly.
This will usually be clockwise to decrease the speed and anticlockwise to increase it.
Rated 4 out of 5 by elterchris from overhead door closer fitted 3 of these in the last couple of weeks.
Eclipse 28730 fixed size 3 overhead silver door closer maximum door weight 60kg.
Backcheck no backcheck facility.
Maximum door width 950mm.
Next take the tool needed this may vary depending upon the design of the door closer to make the change and turn the valve.