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Is there a connector anywhere that has a wire clamp and round metal washer like on a battery terminal?
You want an eyelet, there are many kinds, either crimp-on or solder fitting. Start your exploration here:
http://www.maplin.co.uk/p/maplin-insulated-crimp-terminals-eyelet-red-32mm-jh67xYou can get eyelets with screw cable clamps, but soldered is best as mechanical clamps tend to corrode and/or loosen by creeping, degrading your connection.
OT question. I picked up a pair of Leak Sandwich speakers in a charity shop. They have an amazing sound. But I'm trying to find a system to connect the speaker cable/wire to the simple screw at the back of the speaker - I'm losing half my wire when I screw it down. Is there a connector anywhere that has a wire clamp and round metal washer like on a battery terminal? Cheers. Links appreciated.