For the options (line release orientation, conventional or reverse, accepts mono or not), holding power, smooth trigger pull, overall quality, price, and the fact that spearguns are allowed in your country, I think it makes better sense to buy a ready trigger mechanism. Perhaps someone else will contribute with instructions on how to make a trigger mechanism. In the meanwhile you can take a look at Tufual's thread, he made his own mech http://spearfishing.world/spea…-pine-speargun-build.html
Posts by Dan
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Which shafts are you going to use?
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These are the trigger mechanisms most commonly used in speargun builds Speargun Trigger Mechanism.

They accept shafts that have a flat area in the back.

If you're going to be buying shafts, you need to make your trigger mechanism choice based on the shafts available at your location.
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Will you be making your own shafts too? The mechanism in your picture accepts a shaft with a round end. Is that what you want?
What kind wood do I use? / Heavy or style? Name wood's?
I teak is available, it's the best choice. It's not necessary to coat the wood with a protective finish. Oiling is enough.
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For a wood gun you will need a trigger mechanism. Have you thought about buying a trigger mechanism or building one?
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If you have good visibility, then you can use a longer gun. Also at 1.73m you're not a short fellow, so you can load a longer gun. I recommend a 110cm - 120cm speargun, with two 16mm rubber bands.
Do you want to make the gun from wood?
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How is the visibility where you plan to use the gun? How many meters?
What is your height?
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Great pics. Thanks for sharing.
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Thank you Aaron

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Doesn't go fast enough even with two guys paddling?
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How did that work out? Please post a closeup pic.
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"Paddling a fridge" doesn't sound good. Did you mean it's cumbersome? Or that it holds a lot of stuff?
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To be clear, I'm interested in the kayak's performance with two people. How it handles with one person is irrelevant because I'd never take it out by myself. Of course there may be a situation when one diver is in the water and the other must control the boat, but this would be for a short period of time only.
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Welcome to Speardiver. Nice intro.
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Thanks Phil.
Here's some info about the Cabo vs. Zest.
QuoteEven though I have seen both fully rigged and looked them over very well, I have not been in the water with either one. What I can tell you is that as far as stability, they are the same. The length and width are the same. The bottom of the kayak looks to be exactly the same. The only difference I found is that the top section of the kayak is different. The seat and hatch placement are different. The Zest II has a hatch in the stern and center. The Cabo has a large hatch in the bow and a small one in the center and a tank-well in the stern. Having seen both, I am partial to the Cabo. But that is because of the way that the setup looks and because of the hatch placement and tank-well. As to how it performs, I think you will have the same performance either way. The only big difference you will have is the price.
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To you experienced kayak speardivers, is a tandem kayak a good for two divers spearfishing? Is it better or worse than using two kayaks?
Ocean Kayak Zest Two EXP.

Hobie Mirage Oasis

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Excellent video, excellent music. Way to pick your shot on that first hog.
Did you cut the loading butt off the speargun?
What is that little bit in the end (water in blue plastic)?