"slate_leeper" wrote in message
...
OK, I found two products. What do you all think of these?

http://www.builderdepot.com/browse.i...odstoreid=3983

These look like they can be stacked and/or sanded to produce the exact
depth needed. Disadvantage - they come in 25 packs.


http://www.improvementscatalog.com/product/id/100584.do

Looks quick and easy, but will they be sturdy enough? Alternative: cut
exact-depth spacers from steel tubing?


What's wrong with one of these: http://www.aifittings.com/m_9.htm They are
available individually at an electrical supply. There's no reason to trim
them, but they can be easily cut with aviation snips or BX cutters.