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The TOA design is an triplet with a wide air space gap between I think one of the lenses. That is why it has a split part way down the tube. I assume that is where that 3rd wide air spaced lens is.
I would simply retighten the tube as it most likely is merely the tube was loose and simply tighten it.
I do believe collimation is critical with the TOA design and is perhaps one reason why others don't copy their design. It requires precise engineering to keep that 3rd lens just perfect. But as pointed out the collimation wouldn't be done by merely screwing the lens cell, that would be adjusting the lens in its lens cell with the collimation screws on the lens cell. Something, I imagine, would be a big mistake to adjust yourself at home.
Greg.
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