The diameter at the knob end is correct, but the taper (more extreme than OEM knobs) and type of plastic causes this jump out instead of sitting on the rail. The OEM knobs were a softer "rubber" that compresses on the rail and stays in place. I tried cutting the sides near the base but to no avail. So far I haven't been able to find a product that matches the Levolor button on Revain.
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