In the meantime, take your tranny apart. The pin people are talking about is the one that holds the gears to the top shaft. It's pretty obvious when you have it apart. Even if it looks good, you might as well bullet-proof now it by using a cut-off hex wrench to prevent it from becoming a problem.
After all;
An ounce of prevention is worth a pound of cure.
and
The system is only as strong as the weakest link.
and any more cliches that apply...
