I am making carbon fiber pushrods with 4-40 all thread ends JB welded in place.

How far does the all threads need to be inserted into the carbon fiber tubes? I was thinking about 1/2", would this be enough? . I am also JB welding 3/8" long aluminum sleeves on each end of the tubes. The longest rods will be 4 to 5" of carbon fiber.

Is JB weld the best glue for this operation or is there something better?

They will be installed on a 60" Edge 540 with a Saito 91.

Thanks
Dowayne