Plastic Push Nut
A home owner from Livonia, Michigan says:
September 3, 2012
A plastic push nut that retained the spiral balance screw slit in two parts. Attached are two photos. The nut fits into a 1/4th inch sq. hole, is 5/16 inch deep, and has a 3/8th inch sq face dimension incl. the ears. I'd like to buy a few repacement nuts if it is available.
Paul from SWISCO responded:
September 5, 2012
Thanks for posting! The part you appears to be looking for seems similar to our 26-200 Balance Screw Plug. Please compare it to your own hardware.