This old horn arrived in my shop to have some dent”al” repair. While I mostly work on telescopes, a challenge is always in order. Caution must be-used as you can easily cause more damage than you had before. Technics are the same for removal, turned lathe slugs of brass and aluminum which are forced fit into the openings, ball bearings of all sizes that are sometimes driven through with compressed air. It basically comes down to years and years of experience.
Kurt Armbruster is wondering what all the noise is about.
A barrel ready for re-work is completely stripped of its exterior and interior parts including all light diaphragms, cradle mounts, focus knob, butt end turnings, objective mount and all screws.