Leave it dry. Lube may help but it soon gets dirty ( these sets are dirt
magnets ). Also most of the Zeniths back then used a friction drive
for the UHF. They had a spring loaded fly wheel driven by a small
shaft. Had to often clean them with lighter fluid when they slipped.
The VHF indicator disc when used would distort from the wrong lamp.
IIRC they used a #159 or #259 lamp. Wish I could remember the
tuner assy on this one but being a remote didnt see that many.
Remote was a $100 + option back then !
73 Zeno
LFOD !