Markings on the tracer head are HL-8, Linatrol, K.N. Aronson, 3926D32G02, SN. 0094
and on the section that holds the lamps L & S AG3, 1666C46G0, SN. 13412. On the alphanumeric strings I was making my best guess as they are not very legible. Table was manufactured in 1993. My part that turns is on the very top of the tracer head. The bottom of mine does not appear to turn, the only marks I can find near the lower portion appear to be scratches where the head has run into things. I am on my way to walmart to get some lamps.
Thanks
Arlen