A professional from New port Richey, Florida says:
April 26, 2017
I need the plastic piece that hold the balance spring in place. I included photos of the of the part in photo 1 and 3. photo 2 shows the broken one. Photo 4 is the balance spring. I need 10 of the parts.
Tom from SWISCO responded:
May 1, 2017
Hello. We believe you may need our 18-161 sash guide. Please take a look and let us know if you agree.