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Blackjack 29 3/16″ H/Duty driveshaft upgrade kit PB305K
Blackjack 29 upgrade shaft and collet
Proboat shaft is 4mm wire – 3/16″ stub
RCBB shaft is 3/16″ wire – 3/16″ stub so no strut change required
Either remove the teflon liner to accept the larger dia wire or do the job properly with following 3/16″ tube and liner- 514B20, 212B20.