It is very likely the at your lens can be repaired. A definite estimate can only be determined after a physical inspection which is fairly inexpensive (about $15-$20). Deciding on if it is worth it depends on the cost of a replacement versus the repair estimate. Companies frequently offer refurbished units at discounted prices.
If you would like a reasonable repair vs replace cost analysis please let me know the brand and specific model of the lens.
United Camera is a good service to use for this type of repair. Please see the link below
Please keep in mind that my diagnosis & solutions provided are directly dependent on the accuracy of your description of the problem. As with any "do it yourself" fixes, success is a "team effort", since I can't see or touch the camera, and relies on the customer's manual dexterity and ability to follow the instructions well. If the "do it yourself" approach doesn't work out for you and you need conventional repair, please let me know.
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