Ignition lock removal conundrum

["Steve B. Gerow" <steveg@abrazosdata.com>]

I'm trying to replace the lock cylinder. I turn it the right way so the
detent pin should be aligned with the hole in the lock body. Inside the hole
I see what looks like black bakelite and part of a coil spring. Pressing
with a drift, phillips or blade screwdriver through the hole doesn't do
schlitz.

Would appreciate guidance on how to get the cylinder out.

Thanks in advance.
-- 
Steve Gerow
Pasadena CA
59 BN6