<https://www.woodystraction.com/product/indexing-tool/#product>
<http://schema.org/description>
"The edges of square single support plates must run parallel to the edge of the track. Use Woody's square indexing tools, available for 5/16\" Digger and Grand Digger support plates, to get the job done.\r\n\r\nTriangle support plates are marked with a dot, which must face the direction the track is rotating. This can be done with Woody's indexing tool for Triangle Digger support plates.\r\n\r\nAll of Woody's indexing tools fit on a standard 3/8\" ratchet."
<https://www.woodystraction.com/product/indexing-tool/>