Hi everyone.
Can any advice be offered to adjust the "speed" of my 105? It's running fast.
Thank you in advance.

If the watch has not been serviced in a long time the watch will run fast just the opposite of what a logical thinking person would think.

What is happening is the train is dirty which makes the pallet fork not put enough pressure on the roller jewel. That makes the balance wheel NOT have a good ark.

Yes you can try to adjust but that is not the problem. It's time for a Clean and oil. Then it should run like a top with out any adjustment at all.