I finished mine and checked the accuracy with various thickness wood pieces (dimensions checked with a digital vernier). Initial results indicate it is accurate to about 0.05 mm. I'll have to do more tests to be sure.
I made mine out of a block of Delrin AF that I have laying around. I used 3 mm diameter for the clicker magnet and 6 mm diameter for the other 2, all sphere magnets.
If anyone plan on using sphere magnets, it is important to line up the N/S poles of the puller magnet before attaching it to the screw. I failed to do that the first go around and just epoxied it on without checking the poles and was wondering why the measurements were way off! After lining up the poles before epoxying the magnet, it is a lot more accurate.
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Last edited by SteveL123 on Thu Aug 10, 2017 2:33 pm, edited 1 time in total.