If you get a grounded screw driver around any hole
it will draw a full arc. Using meter wont as a rule.
Also a humdid day will make it arc.
For cleaning 91% isopropyl alcohol is dirt cheap &
evaporates fast with no residue. Also great for VCR
& audio heads & paths. BUT rumored to harm some CD lenses.
good luck
73 Zeno
LFOD !
BTW that divider may be used in regular projo sets from other
makers too !