I've seen so many people get mad when they leave the 10 pin (or 7, or 8 or 9 pin). Their anger stays with them, not permitting them to focus on the spare. You can tell 9 times out of 10, when such a person, as I used to be, will miss that easy spare.
My solution was to keep the desire to express that anger within me, but off to the "mental" side, UNTIL after I made the spare. My 10 pin conversion rate went way up after I learned to do this.
So, I'd suggest doing the same to everyone who has this issue. Oddly, you'll find that once you've made the spare, that anger will rarely surface. Making the spare kind allows it flow away, so to speak.
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Just like hand grenades and horse shoes, in bowling you only have to get close ...
CharlesT