Hey Good luck! Hope you have a vibration free head. I was concerned years ago. I did a test with high magnification enlargement and a grain focuser. It seems that the grains didn't jiggle nor wobble. My enlarger head is good enough for government work The instructions are excellent and I might muster up enough courage to take change out the fan. The Dichro 45S is a good head that served me well for decades. I had to change out the optio isolator because there was a slight delay after pushing my timer button.