Another alternative is you buy one of Tromic's easy loading gadgets which is a windlass or winch that you attach to a pneumatic gun. The leverage is great as the line hauling the speartip back is wound on a base that is the diameter of a spear shaft. They have been discussed here and people have bought them.
More here https://forums.deeperblue.com/threads/air-gun-easy-loader.74889/page-3#post-833349
PNEUMATIC SPEARGUN HAND LOADERS
We have seen a variety of strung together loading handles that enable the user to muzzle load a longer gun than they could normally manage. I recently purchased the Mares Long loader which is basically three “Clever” loading handles strung on two cords tied in loops on either side of the...
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More here https://forums.deeperblue.com/threads/air-gun-easy-loader.74889/page-3#post-833349
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