Andersen mullion clips
A contractor from Massachusetts says:
November 18, 2012
For my house built in 1984-85 with Andersen windows with snap in 6 over 6 mullions. Plastic clips 12 per window. Like most the clips dried out in the sun and break during cleaning. 5/8" inner width 3/8" height.
Dave from SWISCO responded:
November 21, 2012
Thanks for posting in our Discussion Board. I don't recall Andersen ever using a plastic clip. Are you sure that Andersen is your window brand?
That said, take a look at our 55-184. Do you think you can use this clip? You may be able to modify it to fit. Let me know what you think.