I inherited my Father's antique rolltop desk and it needed some dust removed from the rolltop to make it open smoothly. I vacuumned the rolltop while closed along every movable part and moved the rolltop up and vacuumed the channels it moved in as much as possible. I also used furniture lemon oil on the channels and rolltop too. It worked for me. I have also used candle wax on sticky drawers before. Maybe that would help too. Good luck.
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