John - thanks for all your effort. I met with Jim on Friday and we compared parts. Apparently the corker I have is over 25 years old and Ferrari has changed the design significantly. The replacement part is for their new design which does not fit snuggly into my older barrel. Also, there are no holes drilled for the two set screws that are used in my corker to hold the insert in place. Jim offerred me a replacement corker which is also adjustable and I accepted the offer.
Re: my older corker I was able to use 600 grit paper to sand down the imperfections to the point that I don't believe it will cause me any more grief. In case it does, however, i am armed with the new corker from Jim. Thanks a million!