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This is a good basic flexi drive shaft but like all others it needs maintenance and it will wear. After every session it needs to be taken out and re-greased . When put back into the hull it is important to allow for it to shrink slightly when under power as it is basically a coil that will tighten as it is twisted. Allow for this shrinkage when fixing the drive coupling back onto the end of it so you can see 1-2 mm of slack between the end of the shaft and the propeller. I am waiting for spare drive shafts as mine is worn and needs replacing.