Several of these plastic "stops" have broken in the window frame of my milgard windows. Please see attached. Not sure of what the correct name is for the part, but they appear to be used as stops for the window balancer. This particular balancer is the 31-6. Thanks. Bill
Tom from SWISCO responded:
November 17, 2016
Hello Bill and thanks for contacting us. For a Milgard top sash guide, please look at product 18-188. Let us know how that works out for you.