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Mads performs maintenance on a 44-foot catamaran refit project, focusing on engine heat exchangers, raw water pumps, and propeller assembly. He attempts to salvage a corroded heat exchanger by soaking the housing in PB Blaster and cycling heat on the bolts, though four bolts snap during extraction.4:23 He successfully rebuilds two raw water pumps using $50 Amazon kits, noting the importance of identifying left-handed threads on the shafts and replacing worn bearings that sounded like a "pepper grinder."7:13 Additionally, he scraps 55 pounds of tinned copper wiring, earning $61.60 after removing ring terminals to meet recycling standards.14:25 Finally, he assembles two propellers, using an ultrasonic cleaner to remove grime from the components, though he notes the device’s temperature display is in Celsius despite the packaging’s Fahrenheit rating.17:40 He plans to grease the propellers immediately before launching the vessel to protect the expensive hardware.20:05 Rebuilding pumps and recycling scrap metal provides significant cost savings compared to purchasing new components.

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