If the silicone tube is "squeezed" a bit where it enters the hull, you don't need to worry too much, chances are that there will be no leak.
I assume that there is a flat spot on your motor shaft, that's really important. I hope there is also a flat spot on the shaft as well. Use medium strength thread locker on all these spots. You don't want to strip the threads by over tightening these set screws. Also when you take the shaft out for maitainence, you have to make sure to re-apply the thread locker. ( U-joint--shaft side)
Your method of securing the ESC is fine.
Looks real good!
A tip: Get yourself an eye-drop bottle and but some heavy motor oil , I mix 10w-30 with STP High Viscosity Oil Treament ( oil additave sold at Auto supply shop. 50-50 mix) , this will come in handy when you pull the shaft out for ludrication. For this type of shaft, I find it is better to have heavy oil than grease, for one thing it's difficult to get grease in the tube having to pass the bushing. Unless you have this grease gun: sold at Horizon Hobby;http://www.horizonhobby.com/products...0B#t4-OPTIONAL
For the applcation of oil, this will work :http://www.rockler.com/workshop-glue-injector-3-pack
I assume that there is a flat spot on your motor shaft, that's really important. I hope there is also a flat spot on the shaft as well. Use medium strength thread locker on all these spots. You don't want to strip the threads by over tightening these set screws. Also when you take the shaft out for maitainence, you have to make sure to re-apply the thread locker. ( U-joint--shaft side)
Your method of securing the ESC is fine.
Looks real good!

A tip: Get yourself an eye-drop bottle and but some heavy motor oil , I mix 10w-30 with STP High Viscosity Oil Treament ( oil additave sold at Auto supply shop. 50-50 mix) , this will come in handy when you pull the shaft out for ludrication. For this type of shaft, I find it is better to have heavy oil than grease, for one thing it's difficult to get grease in the tube having to pass the bushing. Unless you have this grease gun: sold at Horizon Hobby;http://www.horizonhobby.com/products...0B#t4-OPTIONAL
For the applcation of oil, this will work :http://www.rockler.com/workshop-glue-injector-3-pack
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