>> I need to remove one or possibly two of the threaded inserts which
are press fit into the crankshaft flange, these are the inserts which
accept the prop bolts.

Angier,

If your just looking for a way to remove the threaded propeller
flange inserts, the secret is to use a socket that is just larger than
the insert cap and purchase some h/w bolts, nuts, and washers that just
fit inside the threaded insert.  You tighten the nut on the bolt that
goes through the flange and the socket will slowly push the insert out
of the flange.  Repeat the process in reverse for insertion.  My A/P
taught me this trick when I replaced all of the inserts awhile ago.  Be
careful not to nick the threads on the inserts as it will alter your
required torque values.  On insertion, make sure you don't get the
insert cocked at an angle on the way in.

Good Luck,

Don