My Dig-220 is showing "low amp" so I want to clean the SC-60 blades to squeeze a little more life out of it. The problem is that the power cord does not easily lift off. I installed it, but I don't recall how it connects, and I don't want to force something that can't be forced.

Do I just keep pulling harder? If that still doesn't release it, can I use some leverage (e.g. a screwdriver under it)?