Speargun Reel Mount for Tubular guns

I got another request for designing a Reel mount for a tubular barreled Gun in the 28-31 mm size, with or without a top rail.

Seems like this should be out there, I don't want to re-invent the Wheel on this one.

Maybe what's out there is junk, is my thought.

Got plenty of other wheels to re-invent as it is.

Didn't see one in Free dive store.

What say you gun experts out there...

I think they didn't want to screw the mount on.

That is a clean design. What is Radius of Curvature of that mount?

Quote from kmo

Aussie Reels - Home
Barry's reels

Thank you, That is the mount the diver (Aussie as well) wanted to get away from. He didn't like it too much, I got sparse info as to why. He wanted a design not like that one at all.

He is willing to pay $$ for a custom one and toss that one out the window.