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When faced with a similar problem I have taken off the coupling, found the witness mark on the shaft and then ground a small flat on the shaft with a Dremel. Reassemble and "feel" for the grub screw engaging the flat on the shaft. A dab of Loctite on the grub screw doesn't do any harm.
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One thing I have noticed with my prop. shaft assembly is the grub screws don't hold very well. I managed, when fiddling about, I could pull the coupling off with the grub screw tightened up. I am always careful when tightening not to tighten too much as I once stripped the threads on an alloy coupling. Anyone else seen this problem? Cheers Spence.
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The shaft can be replaced, sometimes with great difficulty. I had to do that with my Wiesel schnellboot. I built it with three shafts (per Graupner's instructions) and then changed that to the correct four shafts. That required a 5 inch by 6 inch rectangular hole in the bottom.
Lew Florida โฑ๏ธ, USA ๐บ๐ธ
Correction (edit): The cutout was a cross shape. Added photos in the order of the repair.
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Just tried my set-up again today without the prop. shaft connected and everything worked well, motor remained cool throughout, no problems. Will now try with everything connected up. I've noticed where the prop. shaft comes out of the tube at motor end, it is at a slight lateral angle although it turns smoothly. Correspondingly the motor will have to be too. I haven't strained it in any way, I'm guessing it has been supplied to me like this, bit strange. So far so good. Thanks Lew and Chris, you were right, cheers Guys, Spence
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Lew, I was going to use the wooden coupling as a temporary measure to get every thing aligned then swap over to the flexible one as permanent. Sorry to have misled you there ๐คฃ. I've just ordered a solid metal one. Spence.
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