While making a cutting board with a router template, I intended to use a bearing-guided flush trim bit. The amount of wood I had to remove from the workpiece next to the template was excessive for one pass. So, I exchanged the bit’s original bearing with a larger diameter bearing. This allowed me to “rough cut” with the first pass to remove a more reasonable amount of material. Then I switched back to the bearing that matched the bit’s diameter and trimmed the board flush to the template with a second pass.
– Mel Johansen