OK guys, I have found out some information. Maybe helpfull, mayeb not, but it is here non the less.

The plastic arms can crystalize and become very brittle if you do the following: Trim off the un-used arms and then dremel or belt sand them donw to make then smooth.

Trimming the arms is perfectly fine, but the heat generated during "powered" sanding can cause the plastic to get hot and begin to crystalize which can then become very brittle and failures of parts breaking can occur. I normaly trim all of my horns down, but i hand sand them after that. Had never thought ofdremeling them, but I am guessing some people might have. If so could this be a common denominator as to the spline failures some of you have experienced?

This is all I have at the moment. I'm still wokring it guys.