How to to Use a Nylon Shoulder Washer?
Using the schematic option produces ugly results, but I hope the following diagram will help.







simulate this circuit &ndash; Schematic created using CircuitLab

It shows a bolt passing through a single layer of material, with a sholder washer on each side, and a nut, all in cross-section. When the nut is threaded onto the bolt, the washers are held in place.