My winches get serviced annually. This includes complete dissasembly, cleaning, re greasing with waterproof lithium grease. I replaced the original 42 st's with the 46 st;s about twentyfive years ago. (Three sizes bigger than original) We were tacking up the Key West channel in 22 kts apparent with a full main and a kevlar 135% genny about 2 am. The whole top of the winct came apart. The crown assembly, feeder and screws just exploded at once. The drum and internal gears, pawls, etc seem to be fine. We uns 1/2" sheets and the winch probably had a few thousand pound load. We finished the race using ths secondary on the starboard side which is a 40 st. It survived, but we only had to use it for about 30 minutes.