In our area our first generation mallets all had the caps on them for that very reason. We wanted square ends for solid hits and played with them for months.

We've mostly drifted away from them because it lead to mallets being ripped out of our hands. We have players that will hook mallets when you're playing the ball. The caps caused the mallets to hang on each other and usually someone would end up with a mallet being ripped out of their hands.

Capless heads just slid past each other.

I've played with caps and no caps and I've never noticed any improvement in shooting, plus, you can't ball joint with caps.

This area plays with a 1 1/2inch ABS as a standard end form 5-7 inches wide. We square the ends by cutting the ABS with a power miter saw.... brrrap.. cut and square.