Caldwell CP Markings Channel Balance

First, let's confirm your 30" measurement of the channel. It looks correct. A "29 3" stamp usually refers to a 30" balance. As well, that "29 3" tells us you need a "2930" stamp option to go along with your balance. The third piece of info needed to place an order is the balance Series. For a balance with "wingless" attachments like our 19-002 and 15-001, you need either the Series 351 or the Series 390. To tell the difference, measure the bottom attachment as depicted at the bottom of my post. If it does actually measure 1-1/8", you can use an S390-30. If it measures 1" instead, go with S351-30. 2930 is the option, either way.71