[R-390] Oldham and other springs

[Tim Shoppa]

By my measurement the Oldham coupler springs are 1/8" diameter,
0.016" diameter wire, and about 0.65" or 0.75" long unextended
between hooks.

The springs used for the split gears are 1/8" diameter, 0.016"
diameter wire, and about 3/8" long between hooks unextended.

The springs used to pull down the slug racks are 3/16" diameter,
0.020" diameter wire, and about one and a half inches long between
hooks unextended.

These are all fairly vanilla springs, with the exception for the split
gear springs which are a bit shorter than you'll find in standard
packages.

It is fairly easy to wind your own springs or take a long spring and
make it shorter.  See for example

  http://home.earthlink.net/~bazillion/intro.html

I think the original R-390A springs must've been stainless if you want
to be really picky.

Tim.