To secure it along it's length, measure the width across the fuselage at stations about 3" apart.

Cut pieces of 1/8" x 1/2" by the station width and drill holes in them about 1" apart to slide the pushrods through.

Slide them one at a time over both pushrod and put some epoxy mixed with chopped fiberglass on the ends. Then slide them down the pushrods into place. A piece of excess pushrod material will help. If you haven't primed the fuselage yet you can probably back light it to see what you're doing. Otherwise, use a small flashlight.

Do the rest of them and the pushrods will be nice and secure.

Obviously if the fuselage is huge around you may want to use something a little stiffer than 1/8" x 1/2". Just use your best judgement there.