Hi! I love to dry my clothes on an old fashioned clothesline when weather permits and I picked up an almost perfectly good umbrella-style clothesline at the local recycling center exchange area recently. It's been working great but there's no "stop" for the arms (I stuck a large screw in the hole where the stop doodad used to be and it worked fine). I accidentally pushed the collar up too far when trying to collapse it, and now the arms are thoroughly stuck and it won't close. The whole thing is riveted together so I can't just take it apart. I was able to wiggle one of the arms off the end of the spreader bar but it's still just as jammed as ever. Any advice?