I contacted Jensen Optical. They have lots of parts, and best yet, they know what you need and what you do not need. I did not get the same level of support from stonemills. They are more likely liquidators rather than tech support types.
He has all kinds of parts, of will tell you when he gets them Prices are right too....
But I still would like to find a nice Femoneg at a bargain basement price.....May have to buy an entire enlarger to get one...... ( Won't be the first or last time I have had to do that....)