We just changed our old grain sack for a newer but used sail with bronze slides. The slides kept jamming on those stainless banjo clamps (AKA hose clamps). Using a bench grinder, I ground a slope onto the edges of each slide, especially the top leading edge. They needed a bit of polishing with a wire wheel. It hoists and drops like a charm.
Alan & Tracy
Corvus, NS30C #216
Ashbridges Bay, Toronto