Best telescopic driveshaft inner shape? - RC Groups

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T-shape driveshaft+pin joint | Hex-shape+ball joint | Spline/groove driveshaft+pin joint | I need to get new driveshafts for my cheapo fy03. Ive seen many metal telescopic driveshaft replacements, some with hex shape inner, some with 4 splines/grooves and some with a T shape two rods that create contact. Which shape would be the best for durability and strength? Also, would ball joints be better than the pin joint for the driveshaft?T-shape driveshaft+pin joint | https://imgur.com/hXTeocy Hex-shape+ball joint | https://imgur.com/UJZcc3Q Spline/groove driveshaft+pin joint | https://imgur.com/5rEoluL

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