Charlie Springs??

[mlp]

Are "Charlie" springs still round & about or available from anyone?
Does anyone have a description of the physical dimensions &/or the estimated
installed boost threshold the Charlie spring provided over the stock?

FWIW, the stock waste gate spring in a UrS4 is:

Outside Coil Diameter:  1.51" or 38.5mm more or less
Inside Coil Diameter:   1.28" or 32.5mm   "
Uncompressed Height:    3.27" or 83.0mm   "
Wire diameter:          0.11" or  2.85mm

Said, I believe, to be good for holding @ 7 - 8 psi of boost (??) as
installed in stock form without WGFV intervention,
but I suppose YMMV depending on how many cranks of the allen bolt one's
taken to make if you've done that modification.

I'm looking for a "stronger" spring if anyone has a line on any; or a
suggest source for having a spring or two made up.

Thanks

Mike P.