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Oh dear, yet another victim of the cheap Jones-Bird telescope.
Im sorry to have to give you the bad news, but theres not much that can be done to improve this scope, other than to align the optics as well as possible with the lens removed, then putting it back in situ.
The lens acts as a barlow which actually doubles the focal length. The primary mirror is a short focal length spherical type, instead of a paraboloid, and the focal length extending effect of the lens is meant to compensate to some degree for this shortcoming. In short, you cant remove the lens and do anything useful with the scope.
If you use this sites search function on the word "Jones" or "Bird", you will read many tales of woe attributed to this cheap scope design.
Sorry.
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