Bending and flattening stainless rod ?

How about using something more amenable to being bent?
Would 4mm do the job just as well?

This is made from 5mm dia stainless rod. I tried to use 6mm but found it too stiff to get a nice bend.

I made a bending jig to bet the bends uniform and as I was making 10 or 12 of then,

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I already have (and need) the 8mm to take a bit of load from heavy footed crew flailing around the cockpit, and also bcs I have a liferaft cradle and some kitchen racks to make up.

Grinding the rod to an 8mm diameter is not going to leave enough meat to put a s-t screw or machine screw through it, and I also want to make sure that the flattened bit is proximate to the GRP side of the cockpit which a half-sector cannot do.
 
Just weld on a flat piece then. I'm sure you can find someone to do that for a little drinky!

There are several ways of doing this job depending on skills , equipment and material available.

The OP could use 20 x 6 flat but using round bar and flattening the end is an OK method. The end just needed to be heated to flatten the end big enough to drill a fixind hole.

The cup holder is fixed into a 10 mm dia hole to drop the pin into. I have also fixed round rod items with suitable sized saddles / lacing eyes etc.
 
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