Swivel Rod Holders

[Misdirection]

Swivel rod holder is one that spins so you can fight a fish on a bent butt rod out of the holder, like on the show wikid tuna lol. 
I'm just trying to think of the best way to go about swapping the angled rod holder that is factory for a 0 degree aftermarket rod holder. Maybe not even swap but just a way to install with how the gunnels are set up on these boats theres no access to tight a but on the bottom of the rod holder.

Here is a picture of the stern of my 36. I have vertical holders across the stern, including the corners.

Instead of changing the ones on the gunnels, can you just add them on the stern?

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