There are various machines you can use to polish your needle ;-) You can use a drill, dremel or even a lathe. I just use a battery eraser and in this case, one from Foxystudio. Don't know what those rubber tubes are for? Well I did not. They are there to turn your eraser into a lightweight, light duty drill. And in this case, a polisher. Choose the one that will fit the needle. In the case of the Micron needle, it is the smallest one. Just give the back end a lick and push it in. Make sure it is about half way in. Fit it to the gripper and pop it into the eraser body. Do not give it power just yet. It will swing the needle around and it might just fly out. If you hold the tip between your fingers you can control it better. That is the bit you will be working with anyway.