Most of ours Victor screws either do not have paint on them or were painted by the students. The originals were mostly lost over time, so we ordered new ones. I think these might be the ones we got last time. They are slightly shorter than 1/4 inch, but seem to work fine.
http://www.goldmine-elec-products.co...?number=G19045
By the way, I think The Electronics Goldmine is a great place to look for inexpensive components. Most of the motors they carry and some other parts are not FIRST legal. However they are still great for demonstration components, off season projects, training, etc.