A friend of mine stumbled onto this after-market micrometer for Dillon powder measures. UniqueTek Link We ordered a couple of them up, and I installed mine over the weekend. So far I'm VERY impressed with it. The installation was straightforward, but I did read the directions several times to make sure I didn't botch the install.
After installing the micrometer, making the adjustments is MUCH smoother & more precise. In addition to having micrometer markings to easily repeat adjustments, making the actual adjustments is also more intuitive than using the plain factory hex head bolt. There's NO guessing or even thinking about which way you need to turn the micrometer - you just twist the micrometer to a higher or lower number. Easy!
The micrometer before installation:
After installing and sitting overnight to let the Loctite cure.
A closeup of the micrometer markings.
A view from the underside. There are two parts that are held with Loctite. The head of the micrometer is Loctited directly to the powder bar, and the sliding piece in the powder bar is Loctited to the threaded end of the micrometer. With the sliding part now fixed to the micrometer, adjustments are made by the fine threads in the micrometer head, instead of the course threads in the sliding piece (as issued from Dillon).