we the lighter fluid evaporates it will leave a light oil on the rod

"Dave" wrote in message
ups.com...
I recently picked up two nice older indicators on Ebay; one analog, one
digital. It seems that older indicators tend to go fairly cheaply
(especially true if they are not Starrett or Mitutoyo or another big
name). My question is this -- what common problems might be found with
such older units and what cautions should apply to cleaning them up?
Thanks!