We are preparing to offer a kit for owners of early M3s that will allow them (if they have the relevant skills) to accurately check, and if needed, align the burrs in the grinder. We have no interest in making a profit from this, but simply to get more older M3s doing their job.
We are hoping to keep the price of the kit under $50, not including shipping. It will include a lever type dial indicator, magnetic stand, and some method of mounting the indicator to the center shaft. The parts of the kit are not of the highest quality but will do the job nicely. Higher quality equipment would cost more on the order of $175.
About the skill level needed... we will be including rather complete instructions including pictures. If you have the skills to change the burrs you can accomplish the alignment.
Please let us know if you are interested. We have no idea how many to consider making.