Can you take a stainless cane with 3 mm in diameter and drill a hole of 2 mm alongside the cane at the depth of 3 cm? It's fine if you can. Now let's take a cane with 2 mm in diameter and drill an ideal 1 mm hole at the depth of 2 cm. Mind that you don't have any power drill at your disposal but only a primitive hand brace used in 1970. Will you be successful this time? Hardly.