Step 1: Equipment
One grip for a pen, just take it off another pen!:P
One 5mm or 6mm drill bit/screwdriver head.
If a 6mm drill bit you need a glue gun.
If a 5mm drill bit you need a plank of wood, do not use the wall, becuase it is too hard and will ruin your screwdriver head/ drill bit, a plank of wood it the perfect density.
Step 2: Making
Then get your drill bit.
If it is a 5mm drill bit, place the back end into the pen, then get a plank of wood and push, the bit should be pushed into place, try and turn it, if you can push harder. You can later on take this out and change the drill bit, but only with 5mm ones.
If you have a 6mm, it is different. Get a mini glue gun, plug it in. When it has heated, place the nozzle into the tip of the pen, once it has gone soft, take out the nozzle and push in the drill bit, squeeze it into place. This obviously cannot be taken out now.
Step 3: Finishing!
Now get your Screwdriver Pen, grip and lid.
Push the grip on to the pen, slightly, so it is covering half of the drill bit.
Now push the lid on top, you cannot screw it on, therefore the grip should be holding it.
Step 4: Voila!
You can make so many variations and it is cheap, quick and easy to make. Hope you like it please comment, rate and tell everyone,to check this out!