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Kevin,

You absolutely should always cut the tube at the same angle as the hull. This is very important.

If you are using the O-rings (and you should) you need more than 1/8" extra sticking out of the hull. I recommend 5/16" extra with the O-ring on the opposing side in place. This allows enough extra tubing to create the flare and cover the 1/8" O-ring.

In your case I suggest you dig out the tube and try again. It's a simple matter and now that you're warmed up you will be able to do it right.