Trimpot adjustment tool

This is a little add-on part to turn a precision bit screwdriver (I use [this one from Husky](http://www.homedepot.com/p/Husky-8-in-1-Philips-and-Slotted-Screwdriver-Set-74501/100074336)) into a trimmer potentiometer adjustment tool. You can [buy such tools](https://www.amazon.com/dp/B00HKJ90V4/ref=cm_sw_su_dp) cheaply, but why wait for delivery when you have a 3D printer :)

I made a first version as a complete bit to be inserted into the tool holder. It didn't work so well because the delica