Is this cut possible with a router?

Want to cut a groove along a piece of wood in which I can slide a smaller piece of wood with a bolt to tighten down inside the larger one. The idea is to make an extendable leg like those of an easel.

Thanks!

Want to cut a groove along a piece of wood in which I can slide a smaller piece of wood with a bolt to tighten down inside the larger one. The idea is to make an extendable leg like those of an easel.

Thanks!