RM 125 Powervalve help

My son and I are trying to rebuild his topend, 03 RM 125; things were going pretty well till we started reassembly, when taking apart the powervalve rod that goes down into the bottom end would move freely, now on reassembly, it doesn't move much at all making it hard to attach back to the power band on the top end. Should it move freely? What should I do?

Thanks, Chad

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