I have an early Bogen 3021 tripod, and last Saturday the tripod bumped something in my car, and the COLUMN LOCK KET came apart. I purchased this tripod new in the middle 1980's. It's been my workhorse all these years. What ever held the column lock key is now missing. I have the spring still attached, and the column lock key with the hex extrusion key off the tripod. I'm attaching some photos, and does anyone know if I am missing a part which will retain the column lock key satisfactorily? I'll appreciate any help I can get. I don't want to part with this tripod. Thank you.