What is the "toothbrush trick"?

[Craig]

When performing a setup on a tremelo-equipped G&L, you'll need to "level" the tremelo by placing a 3/16" spacer between
the tremelo plate and the guitar's body. I found several old toothbrushes, measured the handle thickness, and many of them
were exactly 3/16" thick!! The toothbrush is usually made of nylon so it won't scratch your guitar either.

(Answer based on a G&LDP post submitted by: Mark Davis)

Admin Note: The dimensions and specs have been tweaked or changed over the years.
The distance between the body and the bottom of the bridge should be 1/8" for instruments
made after 2008, with the exception of the SC-2 which maintains the 3/16" distance.