Nice work on the DTI's. I assume that you are the guy John... 'Doubleboost' refers to when he says he's had dti's repaired. I have an old Starret tool post mic that I've had for 40+ yrs; it still works but is in need of some TLC, the plunger return doesn't return to the same position all the time, there is a discrepancy of approx' .020", & the plastic face / cover needs cleaning / new one. Could you possibly look at it for me? I will cover postage costs & costs for your time or donation to a charity of your choice in lieu. Appreciate PM with your details.