My build looks like black toe, used chain #25 and your idler sprockets, but small holes are not round
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If possible, will you be able to take pictures of the holes that our not round, and send them to customerservice@buildyourcnc.com. Furthermore is this CNC build a machine of ours? If it is not our blackToe 2' x 4' it may be one of our blueChick's 1' x 3' (https://buildyourcnc.com/blueChickVersion42CNCMachineKit.aspx), or blackFoot's 4' x 8'(https://buildyourcnc.com/blackFoot48v40.aspx).