No Subject

 ES> I would think it needs to be a sturdy construction (so the   
 ES> gaps aren't moving in relation to the disc) so I probably    
 ES> want to build it on a steel frame. 

Bonded hardwood or marine grade 1" plywood is plenty sturdy to
handle this gap project. The various components can be bolted
down with carriage bolts for a nice sturdy and tight assembly.

Richard Quick

... If all else fails... Throw another megavolt across it!
___ Blue Wave/QWK v2.12