OverviewLow-friction Carbo Air blocks are lightweight, strong, reliable—and affordable. Companions to our popular Harken Big Boat blocks, these small, compact blocks have very high working loads for safe, easy trimming.Specifications Specification Value Breaking load (kg) 825 kg Breaking load (lb) 1818 lb Length (in) 3 1/2 in Length (mm) 89 mm Maximum line Ø (in) 3/8 in Maximum line Ø (mm) 12 mm Maximum working load (kg) 300 kg Maximum working load (lb) 661 lb Sheave Ø (in) 1 9/16 in Sheave Ø (mm) 40 mm Weight (g) 86 g Weight (oz) 3 oz FAQs Can the main sheave or roller at the pivot base be removed for maintenance?No, both the main sheave and roller at the pivot base are not removable. Can the block sheaves be removed for maintenance?The main sheave and roller at the pivot base are not removable for maintenance. How do I clean and maintain the Harken Twing Block?Periodically clean the release latch mechanism, sheaves, and hinge base with mild detergent and water. Do not use lubricants on sheaves. What safety precautions should be followed during use?Always ensure the sideplate is latched before loading. Do not load the sheave when the sideplate is unlatched. Never use the top latch as a becket. Are there any areas on the block that must not be loaded?Do not use the top latch area as a becket. This area is not designed to be loaded. What is important to check before loading the block?Ensure the sideplate is latched before loading. Do not load the sheave with the sideplate unlatched. How do you open the sideplate for rigging?Hold the block, press the release latch with your index finger, and the spring will open the sideplate for loading. Which area must not be used as a becket?Do not use the top latch area as a becket; it is not intended to be loaded. What should you regularly inspect during use?Regularly check the latch mechanism and ensure the sideplate is latched before loading. What types of boats and applications is the Harken Twing Block designed for?The block is suitable for dinghies, sport boats, and small keel boats. It is used for spinnaker sheet and guy control, and code zero sheet up-down control. What rigging options are available for the Twing Block?The block can be rigged for 1:1 or 2:1 up-down control using the roller at the pivot base. Who do I contact for help with installation, servicing or advice?Contact the SailRACE team — as certified marine experts we're happy to help with product selection, installation and after-sales servicing, before and after your purchase. {"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "Can the main sheave or roller at the pivot base be removed for maintenance?", "acceptedAnswer": {"@type": "Answer", "text": "No, both the main sheave and roller at the pivot base are not removable."}}, {"@type": "Question", "name": "Can the block sheaves be removed for maintenance?", "acceptedAnswer": {"@type": "Answer", "text": "The main sheave and roller at the pivot base are not removable for maintenance."}}, {"@type": "Question", "name": "How do I clean and maintain the Harken Twing Block?", "acceptedAnswer": {"@type": "Answer", "text": "Periodically clean the release latch mechanism, sheaves, and hinge base with mild detergent and water. 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