A machine operator crashed Z axis on a horizontal boring mill for the second time in less than a month. The original motor is still at the repair shop, The mechanical Repairman is off since last Friday for gall bladder surgery.The 32 HP spindle motor has a Heidenhain ROD -323.007 encoder with 1024 pulses per revolution. When we removed the first one,(motor) we damaged the motor gearbox coupling so with a 13 week replacement date, no spare is in house.Therefore, we ordered a replacement encoder,and plan to replace it on the machine without removing the motor. We hope this is possible without a Mitchell Electronics black box. This is an attempt to avoid laying off 25 employees right before Christmas.Thanks in advance.