I don't have a Taunar but I've experienced the same issue trying to magnetise a Reaver. From my understanding the issue isn't the weight of the weapon, it's the turning force exerted on the magnet due to the weapon being very long.
To fix this I simply used much stronger magnets, although the Taunar mount I'm guessing is much smaller than the Reaver. In that case you could also use pins. Get it lined up and use brass rod as a pin, but only glued in one end. I've seen projects such as Thunderhawks where they've used it for the wings and it seems to work well, although obviously you won't be able to pivot the weapon, but it seems a worthwhile tradeoff in my opinion.
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