This one is made with a 3mm carbon stick as a probe.
Had to drill a bit to make it work smoothly.

Для пробы использовал карбоновый стержень 3мм, просто он был а велоспицы нет)
Чутка рассверлил, чтобы влез и не застревал.


// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe at 100.000,100.000 is z=1.155000
// probe accuracy results: maximum 1.155000, minimum 1.155000, range 0.000000, average 1.155000, median 1.155000, standard deviation 0.000000