After You Buy
Because each brand of lax heads is different, I do not drill a hole at the top of the shaft.
If you buy a shaft, you will have to drill a pilot hole that is slightly smaller than your screw, so that the screw will go in easily when you put on your head.
If I were to pre-drill a hole, it could be in the wrong place, which will make the shaft useless to you.
Drilling a hole is very easy, and will ensure that you don't compromise the shaft's structural integrity.
Also be sure to add a butt end to the bottom of the shaft.