In order to accomplish this not so spectacular feat ----- I set up my fence for my router.
I put a pencil mark to tell me exactly where the router bit would be.
I also measured left and right of the bit to indicate where I wanted to start and end the cut.
The initial cut - shown here, would be a plunge cut in order to get started.
And the other side would tell me where to stop the cut as well.
Then I would lift the end of the board up, to get away from the router bit.
As long as I was paying attention - and I was - I did not cut too far, and life was good!
After the first cut, I moved the fence over and finished with a second pass in order to get the correct width groove.
