I have a newish G&L JB 4 string that was factory Plek'd. Since I got it I've noticed the E string sounds a bit different from the other strings, a bit more twangy, less solid fundamental. Looking closely at the bridge today I see deep grooves cut in the saddles for the string to ride in. The E saddle groove seems somewhat off center, not level and kinda makes the E strings at an odd angle with where it leaves the string ball seat at the back of the bridge. Not sure if this causing the different sounding E string or not. Which led me to the question, Do Plek machines slot bridge saddles, or is this something else?