Wow Randy you're game,
I had the exact same problem with my original Tyros variation 4 button.
I'm in Aussieland and they had to airfreight the part (flimsy looking plastic set of inserts) from Japan.

I'm a little worried about the Registration buttons on my T3 now that they're on the RH side; they sometimes require a fast trigger from my left hand.

The problem is (with me as least) when I have to move a long distance quickly, to hit a button; it's hard to judge exactly the pressure with which you're actually going to hit it, hence the anxiety. You don't want to be too light and have it fail to trigger but on the other hand you don't want to be too heavy and risk damage.

Chris