Hey Tom. Yes, they are needed. They serve three purposes. #1 They are the bones of the inner. #2 The are used to wind the outer perimeter coils. #3 They provide the triangle slots for the outer shells. Enough room should be there for a thin layer of dampening material. That black gorilla glue brand duct tape is perfect. Once you cut some strips to put over the triangles in the housing just slide it on.
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