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I have some of my brackets ready to go out.
My turn fin bracket is 1/8" aluminum. in the pictures you will see three mounting bolts into the back of the sponson. I also use a 6/32" stainless threaded rod to connect the top rear of the fin to the body of the hull. This makes it a very strong mount. It is also adjustable by using the two lock nuts on either side of the fin bracket. After you have your rudder set straight, you can now adjust the fin to fine tune your hull to make it run straight.
If you buy a fin - the bracket will be $8.00 USD shipping $2.00
Larry
My turn fin bracket is 1/8" aluminum. in the pictures you will see three mounting bolts into the back of the sponson. I also use a 6/32" stainless threaded rod to connect the top rear of the fin to the body of the hull. This makes it a very strong mount. It is also adjustable by using the two lock nuts on either side of the fin bracket. After you have your rudder set straight, you can now adjust the fin to fine tune your hull to make it run straight.
If you buy a fin - the bracket will be $8.00 USD shipping $2.00
Larry