I've installed a telescoping curtain rod that's 1-1/2" in diameter, and bought curtains with grommets that turned out to be only 1.6" in diameter (outer diameter 2.7").
Unsurprisingly, the grommets don't slide easily at all, especially over the two joint between the telescoping portions of the rod. A curtain wand wouldn't help because if I climb on a ladder and pull exactly where the wand would, the grommets still turn at an angle against the rod and block.
Is there some hack I haven't thought of, or another solution other than getting new curtains (expensive and hard to find - I need 100" W x 95"L blackout panels) or returning and replacing the rod (the brackets were a pain to mount)?
The must be a machine that could file the grommets from the inside, but I don't know the name for it. Essentially, a cone-shaped grinding stone/bit that spins around its axis, so I could lower the grommets and shave off a few millimeters from the inner diameter to reach the recommended 1/4" difference between grommet inner diameter and rod outer diameter.