Possibly the OP could cannibalise a car battery connector clamp as they hold the cable with a couple of screws .Whether the rope would go in to it is another matter .
It doesn't work, I'm afraid. The knot just slips--the ends just pull themselves out. Yes, I tied a perfect reef knot, and not a granny knot. Maybe I have different line to everybody else--the plastic is very soft and thick. It's translucent. I notice that my neighbour's line has a much thinner plastic coating.
I've just tied two reef knots on top of each other, and I don't seem to be able to pull that apart. I'll have to see how it goes. If it doesn't work, I'll have to try some kind of clamping system, as others have suggested here.
I think the OP is serious. Plastic covered or monofilament line just doesn't knot and lock like ordinary rope or string. The suggestion to look at fishing knots is very sensible. In the fishing section of
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