unshaken gearbox cap

["Paul Dorsey" <dorpaul@negia.net>]

Remember to be nice to me, I am a novice who's never seen a Triumph engine
running up close!  Never driven on either.  The abandoned project I bought
has yet to fully materialize.

How does one remove the metal cap under the gearshift knob?  It is the
uppermost part of the gearbox (through which the gearshift emerges).  I've
removed the three small screws and I've tried prying and twisting with a
pipe wrench, to no avail.

Thanks, Paul Dorsey
60 TR3A