Greetings to the group from a first time poster! The enlarger that I received lacked the filter support (beseler part nbr 680-86-04). Do I need this piece in order to use 6x6 filters? This may be a glass part, I am not sure. My problem is that the 6x6 filters appear to be too small to totally filter the light. In other words, a gap between the filter and the curved part allows light to get through unfiltered. Of course, this is after carefully cutting the filter. Thanks in advance. Steve.