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Mike, I am sorry I did not see your comment ahead of. The sagging of your door is a challenge that is most likely unrelated to your door closer. Most most likely anything has settled or changed causing your door frame to go out of alignment. At times this happens for no apparent reason other occasions it can happen if some0one is, for instance, pouring a new foundation next door. Also if your door frame is not securely anchored to a stud or other structural member it could be fairly straightforward the throw out of alignment.
Various companies, such as Rixson and LCN/Glynn Johnson, have specific application surface closers or special application surface applied stops that are made to perform with every other when both are installed on the similar side of the similar door. I have an applications book for LCN/Glynn Johnson, but you could reduce to the chase and phone LCN or Rixson tech support and ask them what their remedy is. They will be happy to inform you.
What differentiates it, is that there are no adjustment screws on the huge facing panel that slides off. Only fastners. And at the end is only 1 adjustment screw. Not two like most tutorials… So I’ve been mucking around with that without having noticing any monitorable final results. I undid it a fair way at one particular point and noticed oil seeping out, but I am hoping that was my loosening, rather than a leek.
some folks they figure a closer (commercial)is a standard no-brainer, there’s a lot more to the suitable installation/adjustment/repair of a closer besides drilling holes in door and frame and fastening the unit to the frame/door and connecting the arm and turning the adjustments on ends/front to adjust the speed or spring, some even been identified to remove the valve screws to obtain out the hard way their closer is hydraulic, as an alternative of pneumatic.