They are different on the 3k flatlines. They use an oring instead of the urethane disk. My guess is the oring did not hold up as well as 4.5k and TK changed the design.
Generally i think the design is fine and machining a single or multiple casting molds is probably pretty doable. The problem is finding the correct material.
Generally i think the design is fine and machining a single or multiple casting molds is probably pretty doable. The problem is finding the correct material.









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