I set the zero stop on my Bushy ERS and it worked well until I dialed more than 10 mils (1 turn). Each time I did this +10 mils became the new zero: after turning to 11 mils I could only turn back 1 mil such that I was now 10 mils too high. This has happened 3 times and each time I had to reset the zero stop. Has anyone else had this issue and/or know how to address it?