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Again, excuse my ignorance, but what are the benefits of the IS? I assume that when one upgrades with this assembly, that you do 2 at a time, if so, then it takes 2 of these to complete the upgrade?
I also assume it is more heavy duty and more reliable. Is this available as an upgrade when purchasing a new unit? If so, we were not even aware this was out there. What is a ball park figure for this upgrade, if I may ask?
Thanks in advance for the reply back.
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