Rusty
You may find it easier and safer to clamp two straight edges to your tabletop and/or work piece, spaced the width of your router apart and centered on your slot.
This will allow you to maintain a straight cut and keep the bit at the proper depth in the collet.
Ric
You may find it easier and safer to clamp two straight edges to your tabletop and/or work piece, spaced the width of your router apart and centered on your slot.
This will allow you to maintain a straight cut and keep the bit at the proper depth in the collet.
Ric 
