I called Hobby Services as you guys suggested, and was informed that O.S. is no longer replacing the "holder" for free. They did confirm through their records that my 105 was manufactured with the over bored seat, yet they said I was too late. That ticks me off. Why would there be a deadline on a manufacturer defect? I personally have NEVER had a good experience with Hobby Services. Enough ranting. I bought the $9.00 part and hope this corrects my issue. I will report back. Again, thanks for all the help.