just thought of this too - i'm not sure if this is happening of not, but is the drag knob tightening up on its own when you pul on the line? if so, then your drag could be assembled incorrectly inside the spool. from the bottom of the spool to the top, the assembly should be as follows - metal hex, teflon, metal circular, fiber, metal hex, fiber, metal circular, c-clip.
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