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Well I will reply most of us here use a different manual they you dont have to pay for seperatley
If your new to OP and don't have Mark's info, than I would say yes, It's worth the $$$. I have one and still refer to it from time to time.
Hello, Yes I am new to OP and yes I have Mark's info., however, I was looking for additional info. Which manuals do you guys read? Thanks for your replies.