On Thu, 4 Dec 2008, Roy Coates wrote: > > > Only those who understood the subject line are likely to know the answer > as to which is best and why ? > Conductive plastic is likely to be lubricated (embedded into the plastic) and may last longer. g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind.