I'm trying to adjust the torque of my door adjuster. The usual place where the hex key is inserted seems to be blocked by some kind of cap:
What gives - am I barking up the wrong tree?
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Either the bottom of the hinge pin has the opening for the hex (Allen) wrench to work, or there are multiple holes visible in the slot in the side where the "holding pin" goes. If the latter is the case, you will need a longer pin to insert in one of the holes that allows to rotate the pin in the direction you need to remove the holding pin, and set it over to another hole. "Walk it" over to the needed amount of holes to make it act the way you need without over tightening it.
Here is a short "how-to" on your type of hinge. Courtesy Doorware.com
The tightening rod they refer to can be an Allen wrench that will fit in the adjustment holes. Use the biggest one you can find, the spring is pretty strong and will bend the smaller size Allen wrenches.