My front springs gets heavily pitted after about 5 months of use. I recently switched to new machines, before I was working with some new generation, and the springs wore out way slower. I run my new machines on less volts 4.5 - 6.5. and push nothing bigger then a 15 mag. Is this normal? They are really good irons by an amazing builder. How long should my front spring last, given I use the machine every day? Whats causing the heavy pitting and why do the springs on eikon machines last so much longer?