RE: Aquacraft Super-Vee 27 Nitro.
Starrett I was able to grind down the coupler with a $10 grinder/polisher I bought from harbor freight. Ground the points down to about half way over the length of itand still had plenty of room for the wrench to grab. Worked good. Ran two tanks thru it and it ran great. The prop nut was slightly loose and thats it. Nothing else came loose. Tightened everything up on the engine and it ran great. Looks like I got a good setup now. In the past I've had the grim 2 blade on it but this time I tried the 3 blade metal prop and was pleasantly surprised how well it ran with that. Very fast! I think the 2 blade comes out of the water a little better though. This sure is fun and a fast litle boat! Hope I can keep it going.