Paul from SWISCO responded:
July 13, 2016
The strength you want would depend on the weight of the sash. Black Tip may be best but I recommend weighing your sash on a scale to confirm. As for lubrication, we recommend white grease.
Finally, you should be able to get the shoe screw you mentioned from a local hardware store. It should be a 3/8" x 6 truss head screw. |