MOTM

>>> Why not get longer pieces that hold more than 10U??  If they were 14U I
could get 40% more modules!!

Sure, but *they wouldn't fit into a 19" rack!* The rails Synth Tech sells
are specifically for mounting modules in 19" rack cabinets. They are custom
made.

There are so-called "flat rails" (12u wide I believe) in the works for those
making wooden cabinets. I don't know what the most recent ETA on those is.
Others are either screwing the modules into wood or using threaded inserts.

You could buy rack rails and sandwich them back to back. I tried that. But
the bend in the "L-shape" of the rails creates a gap between module rows
that can be as much as 3/8" which I found unacceptable. Also, the screws
Paul provides are not rack screws, so you would need other hardware. But the
holes in the module corners can support rack screws; you just lose a little
of the so-called "slop space" for adjusting the moules.